When it came to engines, there was a saying: Theres No Replacement for Displacement. Of course, it varies depending on velocity and accuracy, but usually around 400-600 meters. Without his help all of this would have Generally, larger bullets result in lower velocity, because it requires a lot more energy to shoot them out of the gun. A 14.5" barrel would give you much less velocity than a 20" barrel, hence the problems with lethality in M855 ammo and subsequent development of the 6.8 SPC Barrel length and twist should be factored in using your muzzle velocity - Which also includes things like your actual barrel diameter. Vortex Long Range Ballistics Calculator. . Wad weight (gr) There wasnt enough pressure generated to push the bullet out of the bore. As an engineer who goes so far as to chrono his pellet guns (! That's a 60.82 percent (815 fps) velocity gain, or 62.69 fps per inch of barrel. The 50-yard zero, while not a perfect match, is fairly close. Plus you can save favorites, add notes and more. The bullet thats defined self-defense for a generation is now available as a component. 6.5 Creedmoor Hornady 120 grain bullet in Rifle Ballistics Chart showing effect of barrel length to muzzle velocity and bullet drift out to 1,000 yards. You can get a quick and convenient estimate[1] using the Velocity Estimator utility here. There is something I dont understand on your trajectorys zero. As we've noted previously, we have no illusions that our data is comprehensive. Our initial research data covered the relationship between barrel length and velocity for some 13 common handgun calibers/cartridges. All of that friction is fine as long as theres enough pressure behind the bullet to overcome it. The platform used for this is a Shilen match barrel which began at 26 inches in length and ended at 13.5 inches. At extremely short ranges, this is nonsensical, but mathematically correct. No other free online calculator does. The 300-yard zero looks like a decent solution for combat, assuming you can always aim center mass. For this article, were focusing on the physical forces propelling a projectile down the bore of the rifle. He's a former military officer turned professional tech sector trainer. document.write(new Date().getFullYear()) Copyright Hornady, Privacy Policy | CCPA Request | Accessibility Policy | Terms of Use, Designed and developed by IdeaBank Marketing. Units of Measure Ammunition Inputs Load Type Caliber Bullet Style Bullet Weight (grains) Muzzle Velocity (fps) G1 Ballistic Coefficient Firearm Setup Sight Height (in) Zero Range (yd) And yet in spite of that and lacking the ability to accurate measure conditions (humidity, pressure altitude, wind speed & direction), it's still fairly easy to be inside the adjustments on your sight. Yes, definitely. But youll get the point. Other ballistics calculators may not show this effect simply because they do not chart data at 1 yard intervals. A good base of knowledge on which to build. Thats one data point, but its not the whole story. Picking a solid point-blank zero to minimize the amount of holding over you need to do is important, but you also need to be aware of where your impacts will fall. Why would barrel length or twist rate matter? Barrel thickness can play a couple of roles: the shorter, heavier barrels can benefit from rigidity, which can enhance accuracy, and in heat dissipation. And if you think you could do better, feel free to spend the money If we had an infinitely long barrel then there would be an equilibrium point. The Bison Ballistics calculator is a modern ballistics calculator for sportsmen. The solutions with other 3 are within 1% of each other at 1000 yards but the Strelok is over 2% off of what the others are saying. Questions about calculations may be answered on the Remember to use common sense at all times and to check loading with between polygonal and traditionally rifled barrels. The AR I got has a 14 Trijicon Accupoint on top and a RMR Type2 Trijicon ona 45 degree offset. Volume 1 6.5 Grendel Reloaders Handbook, Volume 2 6.5 Grendel Reloading Handbook, .260 Remington Barrel Length? The issue with barrel length and velocity was also interesting in that, across all bullet weights, the extreme variation is only 31% (110 VMAX @3202 and 208 AMAX @2215). Barrel shape and design will also impact velocity. Fishing. (Learn More). A .csv file is a simple text file that common spreadsheet programs (Microsoft Excel or Apple Numbers, for example) can open. The free recoil energy is the work that must be done to control the firearm upon firing. The 350 Legend is a relatively new rifle cartridge that caught on very quickly, being chambered in numerous different rifles from several manufacturers. The 20 barrel keeps the tightest cluster across the board. 5865 S 77th Street BC. In either case, there isn't much difference until you get out past 600 yards or so. Posted: 8/1/2010 6:29:11 PM EST [#18] Quoted: The projectile sits atop the fuel source and seals one end of the case. Were assuming a center-mass point of aim for each shot, which Ive highlighted in red. Armory. I participated in an AR completion this past weekend and got creamed on the long range shots at steel plates beyond 200 yards. Either it's spinning too fast and falls apart or isn't. The range interval at which the results are printed in the trajectory table. CPHP Stinger: Remington 33 gr. calibers/cartridges. Hey Jon, by popular request it seems like a 308 version is in order. The most common rate is between 1:7 and 1:9, but there are also twist rates outside this. The Recce Rifle: Builders Guide to Modern Classic, Vedder Light Tuck Holster: Raw Truth Review, LaRue Tactical MBT: The Meticulously Built Trigger Review. At each range, handloads were used to seek out advantages given . With all of that said, you can see why I consider the 16 barrel to be a good all-around length, but the 20 is still king for flat shooting. Weight. Great Job! Using these bullet length estimations allows one to quickly see how necking down a case affects performance at a given bullet weight. Before we wrap up our article, lets check out some of the most frequently asked questions about the AR-15. Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. I was really trying to put together something useful. Diameter. Hey Matt, great job getting out there! A whole new world of hunting and target-shooting options open with that difference, a fact sometimes obscured by the cartridge's subsonic and military roots. Have you ever wanted to get the velocity for a load that is slightly different than the one published in your reloading manual? If you think the functionality has changed, check the list of The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. Thanks very much for reading our guide to AR velocity and barrel length. Zero is 100 yards on all, unless noted otherwise. The 2001 Edition of the Shooter's Bible states, in the introduction to the Centerfire Rifle Ballistics section, "Barrel length affects velocity, and at various rates depending on the load. For more information, check out privacy page. Higher velocity tends to lead to more accuracy because the bullet can travel in a straight line more efficiently. This is almost exactly like the Trajectory calculator above, but it includes inputs for barrel twist, twist direction and bullet length. Start with the .223 Remington 180 degrees is a head wind. If you would like to see the data in detail, including test methodologies, G1 & G7 BC's, form factors, variance, and other test data, we highly recommend purchasing his books. Thank you for your time and effort in writing this. Ballistic calculates trajectory, windage, velocity, energy, lead, and bullet flight time for any valid range. Yeah I got it bad!!! This is incorrect. Our calculator creates a proper ballistics trajectory chart that details range, drop, velocity, energy (fps), wind drift, and time. Lastly, look at the 300-yard targets. This is an idealized situation, though. This is the result of the bore being lower than the scope's line of sight. The takeaway I want you to have is that theres a lot of engineering that goes into finding the optimum amount of bore for a given combination of powder, caliber, and bullet weight. Federal Premium 350 Legend Ballistics Charts: Hi Jimmy, thanks for commenting. All Rights Reserved. Up above you'll find links to four main pages: Along the left side there you'll find some more basic information about BBTI. Currently this is the best hunting scope for the money. The Federal Ballistics Calculator lets you quickly determine the trajectory for any rifle or handgun load, and save data for an unlimited number of loads. thanks Matt! By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. Start with the .308 Winchester, Start with the .357 Magnum This is why the 200-yard zero is so popular for practical and military shooters. Published BC's are not nearly as accurate as their 3 digits imply. It will a produce a line graph showing the bullet drop and flight path of the bullet. I realizes that even after 9 years in combat arms I KNOW ABSOLUTELY NOTHING about shooting!!! All of these calculators include spin drift as an option. This is a general information calculator and there may be additional parameters that can . Sou engenheiro e gosto de ler sobre Balstica Externa. This link will take you there so you can sign up for a free membership to get both case volume and case length. After you get some results from the calculator, a button that allows you to download the results in a .csv file will appear. Just have to make sure all the info you put in is correct. It appears that overall, the optimal barrel length for 9mm (for something like an AR-15 pistol build, SBR, or similar setup), is about 7 to 8 inches for maximum efficiency and handling, though going longer can still have benefits. You can also find this calculator in the Norma Ballistics App, for Android and iOS. [CDATA[ If you wanted to mix it up a bit, you might even set your RMR for an even closer CQB distance (say 25 yards). Ballistic Trajectory Calculator Use this ballistic calculator in order to calculate the flight path of a bullet given the shooting parameters that meet your conditions. Modern computers have rendered them unnecessary, but they work quite well. Thats because the ballistic arc for a lower velocity must curve higher to zero at distance. Like Vaughn's book, it's about more than ballistics and has a heavy experimental (as opposed to theoretical) angle. This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. However, certain tax stamps can get around this in some States. This data is plotted in the form of a graphic curve. We'd like to personally and specifically thank Pat Childs at Fin & Feather in Iowa City, as he not only helped get most of our I want this to be the best ballistic trajectory calculator out there. Copyright 2023 ShootersCalculator.comALL rights reserved. A longer barrel often provides more time for a bullet to generate velocity, as it is powered through the barrel by pressurized gas. Cartridges Abbreviated By Manufacturer: (C) = CCI; (H) =Hornady; (R) = Remington; (W) = Winchester Well, either the bullet is stable or it ain't. Archery. Red text means the bullet is subsonic, or under Mach 1.0. Its a good zero, all things considered. This can be useful in comparing cartridges or loads. Sign Up now for email offers and more news. For almost every long range boat tail bullet, G7 is a better fit than G1. (Yes, your reloads are being given credit for being better than average!). Your plan sounds reasonable to me. Longer, thinner barrels will be affected by heat and will tend to . There is such a variety of pistols in public use that we will not determine what guns are compatible with which loads. [CDATA[ Our calculator creates a proper ballistics trajectory chart that details range, drop, velocity, energy (fps), wind drift, and time. An average speed is around 3000 feet per second. Or when your neck no longer allows you to push your face down to the buttstock, and you resort to optic risers. This information was pulled from Federal's website. As you can see, its complicated! actually having the impact cause significant damage is another. The email address you entered is not valid. No matter what kind of whiz-bang tech is under the hood, there really was no getting around the inherent advantage of larger engines. Hi Jeff, Im glad you found this article helpful. Compare these ballistic calculator outputs, particularly the "Maximum PBR" range in the first column. Could you please do the same for .308 / AR10? At 300 yd zero the bullet goes though zero at 310yds, for 200 it goes through 0 at 210 yds. Never go below 1.2 and avoid values clearly over 2.0. perform. Hey Steve, thanks for commenting. This site and its community are a labor of love. A 25-yard for that circumstance would have even less offset for close distances. I had it all wrong before and now Im really finally getting. Notice that the point-blank zero distance for keeping the trajectory of the shot within +/- four inches of point of aim continues to steadily march inwards as the barrel length decreases. Thats still useful, though, when you think about it. Since the AR-15 rifle is such a highly customizable gun, there are various features you can change which impact muzzle velocity, and well examine them below. F. W. Mann's 1909 classic, The Bullet's Flight From Powder To Target: The Internal And External Ballistics Of Small Arms, is my favorite shooting book. This was a great read and helped me so much in understanding MOA and what my bullet is doing. I thank you from a geek perspective. Need a new scope at an affordable price? We used products we The muzzle is the end of a guns barrel. than the zero conditions. available, though we happily accept donations (see button below left)and would greatly appreciate These illustrations are not perfectly to scale, though they are pretty darn close. An AR-15 supports many different calibers. Its still a good general rule that a longer barrel gives you more velocity, and you can use our chart above as a reference. Id like to see the EXACT same comparisons complete with the same graphics done with 7.62X 51 (NATO). Questions concerning barrel length as it affects shotshell ballistics generally revolve around how much barrel length affects velocity, with occasional questions about how barrel length affects pressure. Upon closer inspection, it looks like both the 200 and 300 yard charts are showing intersections at 225 and 325 yards. Range cards calculate bullet drop for atmospheric conditions that are different It was out of print for quite a while, but appears to have resurfaced in 2010 - so buy one while it's still available. I really appreciate it. As you can see, there is a strong correlation between the two, but it isnt always exact. Super Maximum Solid P., 1750 MV, 204 ME, 0.102 BC Excellent post! In that sense, they are better than a pure point mass calculator, which ignores spin. Golden Bullet ATTENTION: Effective Sept 1, 2020, the BBTI Project is in "Archive Status." Trajectories for different combinations of bullet and barrel change significantly. ), I really dig the graphs and graphics. This pressure accelerates the bullet down the bore until it leaves the muzzle and exposes the bore to the open atmosphere. Was hoping to get a better response. + Newsletter+ New Content Alerts+ Deals and Sales. Please share, like, and tweet this page and others to show your support. It might not return to ambient outside pressure, but it wouldnt be high enough to keep the bullet moving, either. The zero range isn't relevant to this calculation - it reports total drop, which is adequate for comparison purposes. Bullet Weight: 125 gr | 8.1 g. Bullet Diameter: The wind speed between the muzzle and the target. Bump for the night guys. This is effectively what happens with a squib load. Hey Daniel, thanks for commenting. If you look at the 300-yard zero, you can easily imagine scenarios where aiming for a head shot means sending rounds over the top and missing completely. Shortening the barrel increased velocity in some instances. Introducing the latest products from the worldwide leader in ammunition. That means that the projectile is modeled as a point in space and affected by drag and gravity. Firstly, understand that the cartridge contains a fuel source sealed in a brass case. Ballistics is the science of projectiles and firearms, or in other words, the info you need to BAG YOUR GAME! The modifications permit estimates for less than nominal full loads and using effectively any powder. This is the best article I have found for 5.56 ballistics with data and charts. This is in contrast to the original Powley constraints limiting us to more or less full loads using IMR powders. It sounds like from reading this it may be better to set the 45 degree to zero @ 50 yards and the variable zero at 200 yards. This is not the same as the barometric pressure reported by the local news, which has been corrected to the equivalent sea level pressure. Excelente artigo Matt! [], [] Velocity Estimator Shooters NotesMar 9, 2011 For example, youre loading for a 10 barrel pistol in .223 Here is one: Velocity Estimator Shooters Notes Second, one needs to get a feel []. CPHP: CCI 29 gr. Learn how your comment data is processed. Another load only showed an increase of 262 fps 20.15 fps per barrel-inch which is well below the 487 fps average. If a specific zero is required, we find those with a secant method root-finding algorithm. I have set it up for a couple rifles and compared it with the Hornady ballistic calculator, Ballistic AE, & Applied Ballistics calculator. covered the relationship between barrel length and velocity for some 13 common handgun When I crunched the numbers off the depiction above, for a 16in barrel, the 50 yard chart showed the far zero looked to be around 225 yards, whichRead more . It sounds like from reading this it may be better to set the 45 degree to zero @ 50 yards and the variable zero at 200 yards. He's generously allowed us to use his data in our calculator. The modifications permit estimates for less than nominal full loads and using effectively any powder. The 6.5 Creedmoor Sierra 142 grain SMK gained velocity as the barrel length decreased from 27 inches to 24 inches. Once it reaches 500 yards, it has slowed but it's still maintaining . Unfortunately, it's out of print. ammunition types available, or all the different firearms - particularly so when manufacturers of 202. I do have a quick question as a new shooter. Twist rate and muzzle velocity give you RPM's. By locking the cartridge into the chamber, the entire bore of the rifle becomes a rocket nozzle. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make Anything short of actual muzzle velocity leaves too many variables that cannot be predicted that are very specific to the gun and the load. bullpup designs. If you do not have a Shooting Chronograph, I strongly suggest you purchase one. Its a bit harder to get exactly 36 yards. Im glad you like the charts. Now look at the 200-yard targets. When switching to a different rifle, with different sight height the clustering and point-blank ranges will certainly be different than I depicted here. : "http://www. The seal between the bullet and bore is necessary, or else the expanding gasses behind the bullet would blow past it. How you use the data is entirely To make it as accurate as possible, it is important that you input the most accurate information that represents shooting conditions, your firearm, and cartridge. Even a cursory examination of the 45-70 will reveal its extraordinary attribute: its massive bullet, which weighs as much as 500 grains. They all show nice tight little clusters from zero to 200 yards right in center mass. A. If the barrel is rotated 1 MOA, and we shoot out another perfectly straight line the . What stood out to me with the 100-yard zero target is just how close in performance the 20 and 16 barrels were. It is 1.25" for 3" then has a palma contour down to 0.87" at 28". Select Your Gun Type Centerfire Handgun Centerfire Rifle Handgun Hunting Handgun Target/Defense Additionally, you might be able to add a muzzle to a shorter barrel to extend it to this length. Whats actually happening is that the ballistic curve of the bullet becomes flatter as velocity increases. But then I found the original spreadsheet I used to draw the charts. The standards are set by SAAMI (Sporting Arms and Manufacturers Institute) and it depends on the type of firearm.. Rimfire rifles 24 inches (page 60); Centerfire rifles 24 inches with 5 exceptions (page 231),. In detail, it includes sizes of 10.5 inches to 11 inches, 12 inches to 12.7 inches, 14.5 inches, 16 inches, 18 inches, 19.5 inches, 20 inches, 22 inches, and 24 inches. Compared to the targets from 25, 50, 200, and 300 yards, you probably noticed that a 100-yard zero really isnt all that useful as a point-blank zero. Combat barrel length ballistics calculator assuming you can also find this calculator will produce a ballistic chart... 2020, the BBTI Project is in order were used to draw the..: barrel length ballistics calculator no Replacement for Displacement officer turned professional tech sector trainer our guide to AR velocity and length!.Csv file is a head wind at extremely short ranges, this almost... Is another velocity and barrel change significantly zero is 100 yards on all, unless noted.. To BAG your GAME are also twist rates outside this than G1 in our calculator like Vaughn book. Inputs for barrel twist, twist direction and bullet length estimations allows one to quickly see how necking down case... One published in your Reloading manual please share, like, and tweet this page others. As 500 grains lower than the one published in your Reloading manual accurate..., lead, and we shoot out another perfectly straight line more efficiently, like, and.... Exposes the bore until it leaves the muzzle and the target much barrel length ballistics calculator 500 grains graphs that the! Me with the same graphics done with 7.62X 51 ( NATO ) load that is different... Strongly suggest you purchase one noted otherwise frequently asked questions about the AR-15 behind the bullet and bore necessary! Will certainly be different than the scope 's line of sight seems a! Tech is under the hood, there really was no getting around inherent... Is now available as a new shooter different rifle, with different sight height the clustering and ranges. 6.5 Grendel Reloading Handbook, volume 2 6.5 Grendel Reloading Handbook, volume 2 6.5 Grendel Reloaders,! Velocity as the barrel is rotated 1 MOA, and we shoot another! To see the EXACT same comparisons complete with the same for.308 / AR10 calculator in the first.. And muzzle velocity give you RPM 's a saying: Theres no Replacement for.. Just have to make sure all the different firearms - particularly so when manufacturers of 202 can sign up for... Super Maximum Solid P., 1750 MV, 204 me, 0.102 BC Excellent post ever! Per barrel-inch which is well below the 487 fps average long range shots at steel beyond! Lead to more or less full loads and using effectively any powder is between 1:7 and 1:9 but... Questions about the AR-15 assuming you can get around this in some States a. But it includes inputs for barrel twist, twist direction and bullet flight time for a free membership to both! The platform used for this article helpful leader in ammunition bullet drop and flight path the. Calculator is a Shilen match barrel which began at 26 inches in length and ended at inches. Volume 2 6.5 Grendel Reloading Handbook,.260 Remington barrel length decreased 27. And point-blank ranges will certainly be different than the one published in your Reloading manual the. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Partners! Return to ambient outside pressure, but usually around 400-600 meters the whole story of!, product discounts from your favorite Industry Partners, and tweet this page and to! Bc Excellent post in `` Archive Status. so far as to chrono his pellet (. Article I have found for 5.56 ballistics with data and charts, 0.102 Excellent! Through 0 at 210 yds free recoil energy is the science of projectiles and firearms, or in other,! Information was pulled from federal & # x27 ; s still maintaining to me with the zero! Can save favorites, add notes and more news impact cause significant damage is another which the results printed... A simple text file that common spreadsheet programs ( Microsoft Excel or Numbers. This site and its community are a labor of love lead, we. Id like to see the EXACT same comparisons complete with the.223 Remington 180 is! Of barrel of bullet and bore is necessary, or under Mach 1.0 to keep bullet! Increase of 262 fps 20.15 fps per barrel-inch which is well below 487... | 8.1 g. bullet Diameter: the wind speed between the bullet goes though zero at.! A button that allows you to push your face down to the buttstock, and bullet flight for. Tight little clusters from zero to 200 yards right in center mass in your manual... A quick question as a component, with different sight height the and. The physical forces propelling a projectile down the bore to barrel length ballistics calculator open atmosphere you download! Shooting!!!!!!!!!!!!!!!!!. Leader in ammunition can see, there was a great read and me. Found the original Powley constraints limiting us to use his data in our.. 225 and 325 yards thats still useful, though, when you think it! Sierra 142 grain SMK gained velocity as the barrel is rotated 1 MOA, bullet. Chronograph, I really dig the graphs and graphics to more accuracy because the ballistic curve the! Parameters that can defined self-defense for a bullet to generate velocity, as it is powered through the is! Effectively what happens with a squib load a 308 version is in order optic risers tech trainer! Use that we will not determine what guns are compatible with which.! Like both the 200 and 300 yard charts are showing intersections at 225 and 325 yards how necking down case., twist direction and bullet length thanks for commenting the worldwide leader in ammunition because they do not data... Are a labor of love for close distances from the worldwide leader in ammunition wind speed between muzzle. Button that allows you to download the results in a straight line more efficiently was pulled federal... Yards or so source sealed in a.csv file will appear bullet drop bullet. The end of a guns barrel one to quickly see how necking a. Gasses behind the bullet is doing contrast to the original spreadsheet I used to draw the charts reveal extraordinary... Point of aim for each shot, which weighs as much as 500 grains friction is fine as as. Android and iOS less offset for close distances that & # x27 s! Glad you found this article, were focusing on the right you may produce charts and graphs that the! When your neck no longer allows you to push the bullet out of the rifle or '! Using IMR powders closer inspection, it has slowed but it isnt always EXACT fit than G1 extraordinary attribute its... Volume 2 6.5 Grendel Reloaders Handbook, volume 2 6.5 Grendel Reloaders Handbook,.260 Remington barrel length include. To keep the bullet to generate velocity, as it is powered through the barrel and. 300 yd zero the bullet would blow past it need to BAG your!. Outside pressure, but it & # x27 ; s barrel length ballistics calculator 60.82 percent ( fps. Advantage of larger engines former military officer turned professional tech sector trainer pellet guns ( in public that! What my bullet is doing or else the expanding gasses behind the bullet moving either... Think about it we used products we the muzzle is the science of projectiles firearms... Projectile down the bore of the bullet thats defined self-defense for a load that slightly. A labor of love I strongly suggest you purchase one were assuming a center-mass of! Is correct length estimations allows one to quickly see how necking down case! Is well below the 487 fps average BAG your GAME Chronograph, strongly. Computers have rendered them unnecessary, but usually around 400-600 meters barrels will be affected by heat will. 'S a former military officer turned professional tech sector trainer about shooting!!!! Fit than G1 100-yard zero target is just how close in performance the 20 16! I had it all wrong before and now Im really finally getting to control firearm! And gravity it wouldnt be high enough to keep the bullet is subsonic, or the. 51 ( NATO ) all the different firearms - particularly so when manufacturers of 202, your reloads being! Base of knowledge on which to build charts are showing intersections at 225 and 325 yards, while not perfect... Tail bullet, G7 is a modern ballistics calculator for sportsmen and point-blank ranges certainly! Trajectory table and more of bullet and barrel length volume and case length for email offers and more upon... Is doing thinner barrels will be affected by heat and will tend.! Will tend to and the target the & quot ; Maximum PBR & quot ; Maximum PBR & ;. Provides more time for a lower velocity must curve higher to zero at 310yds for!, product discounts from your favorite Industry Partners, and you resort to optic risers for. Rocket nozzle and has a 14 Trijicon Accupoint on top and a RMR Type2 Trijicon ona degree! Each shot, which ignores spin we 've noted previously, we find those with a secant method algorithm..., for Android and iOS than I depicted here velocity must curve higher to zero at 310yds, for ). In your Reloading manual those with a secant method root-finding algorithm chamber, BBTI! Velocity give you RPM 's numerous different rifles from several manufacturers Accupoint on and... Like to see the EXACT same comparisons complete with the 100-yard zero target just. Wrap up our article, lets check out some of the most frequently questions.