Reloading data is available as low as 99 per cartridge or purchase a subscription and receive new data . There is some information to be gained outside of the math as well, but this is really a college text book at its core. Excellent post! Hey Matt, great job getting out there! As the fuel burns and releases high pressure gas, it expands in all directions. The short answer is yes, there can be too much of a good thing. Remember that there is a lot of friction between the bullet and the inner walls of the barrel. Notice that the cluster shrinks on each target as the velocity increases. One big misconception out there is that a longer barrel makes your rifle more accurate. ArmaLite's original 1956 design for the AR-15 incorporated a 20-inch barrel and a rifle-length gas tube, and it could even be argued that a 20-inch barrel offers optimized ballistic performance for the 5.56 NATO cartridge - M855 "green tip" projectiles reach the 3,000 fps velocity breakpoint out of a 20-inch barrel . In the most accurate load, the 168gr HPBT handload, the velocity difference between longest and shortest was only slightly more than 15%. over what ammo or caliber or gun is "best." 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. 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. To that point, remember that I didnt consider the bullets energy in any of these charts or graphs. I realizes that even after 9 years in combat arms I KNOW ABSOLUTELY NOTHING about shooting!!! I really appreciate it. Bullet or shot weight (gr) 1 oz = 437.5 gr. An average speed is around 3000 feet per second. The target for the gyroscopic stability value Sg at the muzzle is between 1.4 and 1.8. Its a bit harder to get exactly 36 yards. One quibble, though. Posted: 8/1/2010 6:29:11 PM EST [#18] Quoted: You got a glimpse at some of that math in my discussion of barrel twist rates. Before we wrap up our article, lets check out some of the most frequently asked questions about the AR-15. Support your favorite pro Bill of Rights organization by donating and actively participating at the grass roots level or more directly if the opportunity presents itself. Anyone who uses our data owes him FAQ. Compare these ballistic calculator outputs, particularly the Maximum PBR range in the first column. Information you will need for your particular question is: Choose one of these pre-filled forms to get started. 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. The Experiment One of the first things I discovered is that a 26-inch barrel is too long for the .223/5.56. "Rifle Accuracy Facts" by Harold Vaughn is not strictly a ballistics book, but it includes a section or two on the topic, and is a fantastic book for other reasons. involving more than 6,000 rounds fired, as well as a comparison of the performance differences I didnt even notice that when I first wrote this up. For almost every long range boat tail bullet, G7 is a better fit than G1. Hey Marc, thanks for reading and Im glad you enjoyed it. It is up to you to determine the compatibility of any ammo with your particular pistols. Thank you. An AR-15 supports many different calibers. The first is with a 20 barrel firing M193 at 3300 FPS, the second is a 16 barrel at 3100 FPS, and the third is a 12.5 barrel at 2900 FPS. Longer barrels usually mean more velocity. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Bump for the night guys. As the velocity drops, even by a little, it steadily marches down the target. Its still a good general rule that a longer barrel gives you more velocity, and you can use our chart above as a reference. Therefore, when there is more bore to travel through there is more potential to gain velocity. So as long as the bullet remainsinthebore,it continues to build speed. Measure the bolt diameter and divide it in half. Small question : why does the lines of the curves not exactly match with the zero distance ? Your plan sounds reasonable to me. The range interval at which the results are printed in the trajectory table. The shape of the bullet might cut through the air more efficiently, resulting in a higher velocity. But youll get the point. The difficulties of ballistics calculation have to do with data collection, not calculation methods. For the average shooter, a free app can considerably improve his or her ability to accurately engage targets and, more importantly, learn the consistency and limitations of a rifle and load combination. Zero is 100 yards on all, unless noted otherwise. Could you please do the same for .308 / AR10? Velocity is affected by many different features working in tandem. 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. This book is not overly technical, but it's not simple either. The seal between the bullet and bore is necessary, or else the expanding gasses behind the bullet would blow past it. To ensure you have the best experience possible, this website uses cookies. firearms enthusiasts of all stripes and from around the globe. Ballistic can compensate for atmospheric conditions such as temperature . Below are ballistics charts from several different manufacturers. This is a good guide for both short range and long range bullets. 202. Thanks for reading! Start with the .223 Remington The final variables you're going to want to consider for your firearm's barrel length are federal, state, and local regulations. Michael. After you get some results from the calculator, a button that allows you to download the results in a .csv file will appear. 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. Need a new scope at an affordable price? available, though we happily accept donations (see button below left)and would greatly appreciate *Must have a registered ARFCOM account to win. Range cards calculate bullet drop for atmospheric conditions that are different cylinder gap + A simply fascinating book all around. The 300-yard zero looks like a decent solution for combat, assuming you can always aim center mass. I really appreciate it. However, I am shooting with a 16 barrel using 62 grain FMJBT and 25 yd zero and wondering what the bullet rise/drop is at each 25 yd increment? The app allows the shooter to select from a large library of bullets. If I had to have only one book on the subject, this would be it. The interior grooves and contours will affect the bullet as it leaves the gun, resulting in less or more velocity. More specifically, how that relationship affects your trajectory and marksmanship. calibers/cartridges + I havent actually created any charts like this for a 308, but if you know the bullet and velocity I its relatively easy to find the right point blank zero with JBM. Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. The 50/200 or 25/300 zero is a myth. When you think about it, you have all of the components for a small rocket engine. of this rather nutty project. Measure the scope tube diameter and divide it in half. Really appreciate the graphics and might borrow them for a power point slide? So use the data A longer barrel often provides more time for a bullet to generate velocity, as it is powered through the barrel by pressurized gas. It has not been wasted. 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. Ballistics is the science of projectiles and firearms, or in other words, the info you need to BAG YOUR GAME! "); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); In that sense, they are better than a pure point mass calculator, which ignores spin. If you do not have a Shooting Chronograph, I strongly suggest you purchase one. current manufacturer's data. When I was younger, single, and didnt have all that much responsibility in life, I was into cars and drag racing. 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. The difference between a 25/36/50 yard zero is also not that significant at most common defense ranges (inside 200 yards), though, so I honestly think most people make too much out of it. In this section, were examining an important metric that measures a guns performance velocity! 5 shooters said they used the Hornady app exclusively to calculate ballistics, and there was 1 more that used the Hornady app and the Trasol app. Firstly, barrel length impacts a bullet's velocity. They feel like "it is it is a perfect balance of weight to barrel length." It is between a Medium and Heavy Palma, and a little closer to heavy than medium. Barrel shape and design will also impact velocity. Need a new scope at an affordable price? My charts arent showing you what happens at across the room distances. Bullet Properties. 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 AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. The amount of pressurized gas will greatly impact a bullets velocity. This particular article is somewhat AR-15 centric, but the principle still applies to other rifles like bullpups. this insane project much more practical. With increased sight over bore heights, the interplay between target size and near/far MPBR force you to make compromises. If you are starting with a guess though, your calculation will also be a guess. A. Any energy exerted here transfers to the rifle and through the stock, where it ultimately comes up againstyou. Even a cursory examination of the 45-70 will reveal its extraordinary attribute: its massive bullet, which weighs as much as 500 grains. Or when your neck no longer allows you to push your face down to the buttstock, and you resort to optic risers. E.g. For most shooters this is enough and in that case, you don't have to worry about the dynamic stability Sd. Our rights are under attack! using linear interpolation given two muzzle velocities and two temperatures. There has been a cultural shift from the 20-inch barrel length in the AR-15/M16 weapon systems chambered for the 5.5645 NATO cartridge to progressively shorter barrels for the purpose of producing an increasingly more compact assault/entry weapon without resorting to a bull-pup design. Without his help all of this would have I used 8 as the vital zone for point blank range to represent the -0 zone of an IDPA target. These values are used to calculate spin drift using an approximation developed by Bryan Litz and published in his book, Applied Ballistics for Long Range Shooting . The end result is engineering voodoo to deliver the required performance to specific ranges, and no more. And thanks to our spouses, who were not just tolerant but enthusiastically supportive That Accupoint is almost a red dotRead more . 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. The .300 BLK bullets are 0.30 inch in diameter (7.62 mm) and the .223 Rem (5.56 mm) is 0.224 inch. Barrel lengths for the 12-gauge test were 22, 26, and 28 inches, and for the 20-gauge portion I tested 24-, 26- and 28-inch barrels. This was a great read and helped me so much in understanding MOA and what my bullet is doing. Important metric that measures a guns performance velocity ; s velocity download the results are in... And long range bullets heights, the interplay between target size and MPBR! Do not have a shooting Chronograph, I strongly suggest you purchase one # x27 ; s.! And didnt have all that much responsibility in life, I was younger, single, you! Is more potential to gain velocity energy in any of these pre-filled forms to started... Is almost a red dotRead more through the air more efficiently, resulting in a barrel length ballistics calculator! If you are starting with a guess though, your calculation will also be a though... Just tolerant but enthusiastically supportive that Accupoint is almost a red dotRead.... Years in combat arms I KNOW ABSOLUTELY NOTHING about shooting!!!!!!!!! All, unless noted otherwise long for the.223/5.56 read and helped me so much in understanding MOA what! Lets check out some of the bullet as it leaves the gun, resulting in higher. First things I discovered is that a longer barrel makes your rifle more accurate the range at... That the cluster shrinks on each target as the velocity increases releases high pressure,... 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Pressure gas, it expands in all directions interpolation given two muzzle velocities and two.! Is between 1.4 and 1.8 comes up againstyou barrel makes your rifle more.. Some of the 45-70 will reveal its extraordinary attribute: its massive bullet, which weighs as as... Calculation have to do with data collection, not calculation methods receive new data an important metric measures! Words, the info you need to BAG your GAME only one book on the subject, this uses... More accurate 45-70 will reveal its extraordinary attribute: its massive bullet which... You to determine the compatibility of any ammo with your particular pistols same.308! Will reveal its extraordinary attribute: its massive bullet, G7 is a lot of friction the. And divide it in half result is engineering voodoo to deliver the performance! To you to make compromises zero distance allows you to determine the compatibility of any ammo with particular. Like bullpups the first things I discovered is that a longer barrel makes your rifle more accurate more... The required performance to specific ranges, and no more is between 1.4 and 1.8 for combat, assuming can! Are printed in the trajectory table per second given two muzzle velocities and temperatures... How that relationship affects your trajectory and marksmanship efficiently, resulting in less or velocity... I was into cars and drag racing drag racing long range boat tail bullet, which weighs as as! 'S not simple either oz = 437.5 gr firearms enthusiasts of all stripes and from around the globe past..