But it can also be rewarding, and highly educational. Great info! Ryan Cleckner is a a former special operations sniper and author of the Long Range Shooting Handbook. Getting consistent hits at extreme distances requires specialized rifles and optics. YouTube - Store data on what videos from YouTube the user has seen - 2. //-->, Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. All of the figures that follow are taken from the Speer Reloading Manual Number 13. Ballistic Performance of Rifle Bullets, 3rd Edition, 6.5mm (.264 Caliber) 144 grain Long Range Hybrid Target. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". It has a better trajectory than the lighter 36-grain and 40-grain bullets. Mach 1 = 1116.48 fps @ ICAO Standard Atmosphere). We appreciate your patience and continued support! They need to be able to factor in how far the wind will move their round, bullet drop, and velocity at different ranges and it all ties back to the BC of their particular load. Due to the sensitivity of BCs to velocity, it can highly skew the comparison. This will support more accurate trajectory predictions, including wind and drop predictions. One must take barrel twist into account depending on the type of 243 Win cartridge that is fired. My takeaway is this data is really of more interest to long range (over 300 yards?) Ballistic Coefficient (B.C.) There are lots of ways to get around the expense @Tio, The thought part is the most important and that costs nothing. .243" 100 grain Round Nose (BC .216): -1.5" @ muzzle, +4.8" @ 100 yards, +6" @ 200 yards, 0 at 300 yards, -15.9" @ 400 yards, -46" @ 500 yards. The flat point Pro-Hunter has a ballistic coefficient of 0.185. At a MV of 3100 fps a .224" Speer 52 grain BTHP Match bullet zeroed for 300 yards has a 500 yard drop of -43.9 inches, not much better than the 6mm round nose bullet in our trajectory examples near the beginning of this article. I dont see how a BC can be constant for varible velocities over a given trajectory. Scott Rupp gets a chance to talk to Aaron Oelger about a few new products from Hodgdon and why reloading store shelves are empty. Hornady . Provided by Google Tag Manager to experiment advertisement efficiency of websites using their services. Its that simple. For example, some manufacturers measure BCs over long range while others only provide BCs tested over short range. Punching holes in a target? Introduced in 1997, the .260 Rem. I assume the muzzle energy for the 2 bullets has a typo. These two bullets, while of the same weight, have different ballistic coefficients. There are actually several different standard projectiles with different measurements and they each measure drag in a different way. However, some point out that since rotational velocity maintains itself much longer than downrange velocity, it must, to some extent, affect expansion via centrifugal force. The cookie is used to store the user consent for the cookies in the category "Other. In the end, the best way to understand the performance comparison between two bullets is to enter their details into a ballistic solver including the muzzle velocity, and see how the predicted drop and drift compare, all things considered. Absolutely not. Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. Our first offering in the Blackjack Bullets lineup is the 25 Caliber 131 grain ACE Match bullet with an outstanding 0.330 G7 Ballistic Coefficient (1000 yd Average BC) tested on the Oehler 88 System. For example, consider a smaller caliber like a 6.5mm (.264 Caliber) 144 grain Long Range Hybrid Target thats relatively heavy for its caliber, compared to a larger caliber bullet like a .308 Caliber 175 grain OTM which is absolutely heavier, but is relatively light for its caliber. Speed and Energy are figured out using an average of all the known cartridges. The .30-06 Springfield was better than the .30-30 because it spit the same .308-inch bullets 400 to 500 fps (feet per second) faster. This makes the bullet less sensitive to seating depth and makes load development much easier. The slower the bullet the less range youll have. Simply a .308 case necked down to hold 6.5mm bullets, it was a popular wildcat before being adopted by Remington. The goal was to be able to predict how far projectiles would travel, the arc of flight, and at what velocity they would impact targets. The BC of a bullet is a ratio calculated by a mathematical model based off of its density and its particular shape. #4. He is interested in helping folks protect themselves with firearms and shoot better at the range. This is an Alexa Analytics cookie that is used to track user behavior. Weve got a dedicated section for the AR-15 here. But a higher ballistic coefficient doesnt necessarily mean it is a better bullet. Mag., and .300 WSM.and as a component for handloaders. Heres what you need to know about drag models. Korean combat vet playing around with the 300 BLK in a mini 14 and the 7.62 in a mini 30. When fired from a .257 Creedmoor (a 6.5 Creedmoor necked down to .257 caliber) and mated with a 1-in-7 or 1-in-7.5 twist barrel, it will shoot flatter and hit harder than almost anything the 6.5 Creedmoor can launch. The highest-BC 7mm match bullet is the 190gr Hornady A-Tip Match, and the highest-BC 7mm hunting bullet is the 195gr Berger EOL Elite Hunter. If looking to acquire an automated powder-charge dispensing unit to speed up precision reloading, don't judge the RCBS ChargeMaster Lite powder scale and dispenser by its name; the Little Green machine packs a heavy-weight punch with speed and accuracy. Variation in BC with Velocity (G1, G7, etc), Manufacturing Effects on: BC, Accuracy, and Precision. A cookie set by YouTube to measure bandwidth that determines whether the user gets the new or old player interface. Type your new password and hit button below to confirm it. google_ad_slot = "7610963244"; The cookie is set by crwdcntrl.net to collect statistical data such as the number of visits, average time spent on site, and what pages have been loaded, for targeted advertising. However, you may visit "Cookie Settings" to provide a controlled consent. Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. A bullet with a high ballistic coefficient is slippery and less subject to drag (slowing down) as it continues on its merry way. document.write(new Date().getFullYear()) Copyright Hornady, Privacy Policy | CCPA Request | Accessibility Policy | Terms of Use, Designed and developed by IdeaBank Marketing, drag coefficient based trajectory calculations, Product Warning & Recall Notice - Item #8263, Product Warning & Recall Notice - Item #90226, Product Warning and Recall Notice - Item #9249, Product Warning & Recall Notice - Item #81153, Product Warning & Recall Notice - Item #82730. Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. And when practicing @ a firing range, you want to use bullets designed for what you want to do; the bullet that gives you the best score shooting @ targets & the one that is best for hunting any particular animal will probably be quite different. As a fudge factor, the ballistic coefficient is usually a number between one and zero, but not always. His books are available in print and eBook format on Amazon. Two measurements that help define the downrange performance of a bullet are ballistic coefficient and sectional density. Kimber's Hunter Pro Desolve Blak takes the firm's more affordable mountain rifle to new heights. Learn more about our new Long Range Hybrid Target bullets. BC might sound like a bunch of hooey, but it's really at the heart of bullet performance. The Hornady ELD-X (Extremely Low Drag - eXpanding) bullet is a technologically advanced, match accurate, ALL-RANGE hunting bullet featuring highest-in-class ballistic coefficients and consistent, controlled expansion at ALL practical hunting distances. Data are also found in the accompanying charts. Out of curiosity, how do you calculate the bc? Take a look at the bullets themselves and what we learned. Adding more tin, the weight can go down to 545gr from the same mold. Get proficient on YOUR time. BC will help you determine the effective range of a projectile by taking drag into account. They like that they are lead free; that they retain 100 percent of their weight; and penetrate deeply. Why Is Knowing Your Rounds BC Important? He currently teaches concealed carry courses and enjoys spending time in Floridas Nature Coast. With the right BC you can make a . Fifty years ago, when hunters argued over which cartridge was best, they focused on muzzle velocity. Ballistics Coefficients - Rifle 1450 .224 50 BlitzKing .142 .248 @ 3300 fps and above.243 between 2650 and 3300 fps .232 between 2050 and 2650 fps . I suspect this would lower the BC..but any idea how much? For this example, I am going to use a Hornady 30-06 Springfield load with a 125 grain SST projectile, With that said, the number the manufacturer gives you is a rough estimate. Ballistic coefficient makes a tremendous difference in downrange ballistics. Vimeo installs this cookie to collect tracking information by setting a unique ID to embed videos to the website. Its a lead-tipped, jacketed bullet with a flat-point tip and a flat base. My next preferences is Sierra, Swift and Hornady.