All Rights Reserved. Google DoubleClick IDE cookies are used to store information about how the user uses the website to present them with relevant ads and according to the user profile. I agree with the entire article and its explaining of coefficients and their applications. In summary, comparing BCs is a natural thing to do for shooters interested in long range performance. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. I'm looking at building my own ballistic computer and it's been difficult to find the actual equations for not only bc but for everything else for long distance shooting. Hand-Picked Daily GUN DEALS, and Exclusive Coupons Codes >>>. When comparing BCs of different bullets, it is important to use an apples-to-apples approach. Thanks! Also notice the big difference in BC between the round nose bullet (.216) and the spire point bullet (.357). They are both going to fall at the same rate due to gravity, but the arrow will travel farther in the amount of time it takes both objects to fall. I suspect this would lower the BC..but any idea how much? The same Doppler radar verified Heat-Shield Tip is unaffected by aerodynamic heating and retains its shape to offer some of the highest BCs you can find in a hunting bullet. That said, here are the super bullets that are best suited to the .30-06. He is interested in helping folks protect themselves with firearms and shoot better at the range. The test_cookie is set by doubleclick.net and is used to determine if the user's browser supports cookies. Without getting into the math, I'll define the ballistic coefficient in words as: The ability of the bullet to maintain velocity, in comparison to a ' standard projectile '. There are actually several different standard projectiles with different measurements and they each measure drag in a different way. This makes the bullet less sensitive to seating depth and makes load development much easier. Granted, for 80 percent or more of the game (whitetails) shot by Americans, bullets don't really need to hold together and penetrate particularly deeply to provide clean, humane kills. tried some sierra boattail in 300 win. My question is to what extent will bullet weight affect BC in a cast bullet where the outer dimensions are held constant, but the weight may vary with the alloy used. Its great for accurate target shooting. A bullet's ballistic coefficient is based on a few different factors, the first of which is weight. This is an Alexa Analytics cookie that is used to track user behavior. Unfortunately its not as simple as just comparing the single numbers. We cover this subject further in our next article, Form Factors. G1 is most commonly used because its the old standard and the industry has not adapted to the more modern incarnations. "These new bullets beat everything out there, even at the highest levels of competition, by 20%." - Alan Warner, Warner Tool Company. Get 12 Issues a year of the country's best firearms writing. Round Nose bullets have the lowest BC. Since those early days, other smart folks have developed different predictive models on bullet flight based on a variety of bullet types. It wasn't hard to choose a bullet diameter and weight and a cartridge through which to test it: America is still a .30 caliber nation; 180-grain projectiles typically offer excellent sectional density and ballistic efficiency; and the .300 Win. This cookie is used to keep track on user informations and reports it to Alexa analytics service. 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. These bullets also feed very well from the detachable magazines being used by most long-range semi-auto and bolt-action rifles. It will also work with other .257 caliber rifles, as long as they are fitted to barrels with a very fast twist. Mag. Ballistic calculators like smartphone apps and Kestrel devices take as inputs ballistic coefficients for a given drag model. BC is a number that can be used as an input for ballistic solvers to predict trajectories. If your app or device asks for a G1 number, be sure to use 0.646. Its really very simple. How much a bullet slows down depends on the density (thickness) of the air and the efficiency of the bullet. Ballistic Coefficient (BC) values can, and usually do change in value with changes in velocity. 8. It delivers smaller BCs but is consistent throughout the velocity of the round, giving you a much more accurate representation of BC. These bullets have extremely high BCs. Subscriber Services. If they have the same mass and velocity, the energy should be identical. Do you have any more questions? Its that simple. For this example, I am going to use a Hornady 30-06 Springfield load with a 125 grain SST projectile, found here. It doesnt pass through the air, or the animal, easily. I wonder if anyone has validated a continuum mechanics equation with rifle testing a super high speed sensors. The __qca cookie is associated with Quantcast. The following photographs of our test subjects show an unfired bullet, a sectioned bullet and a bullet recovered from gel at 400 yards and a bullet recovered from gel at 50 yards. When it comes to hunting or defensive use, you need the bullet to be in a certain velocity range to ensure the expansion of the projectile when it hits a target. Dont chase a particular BC. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. This is because the value for the shape of the bullet is determined by how close its shape is to the drag model. With an Accu-Fit stock and left hand adjustable bolt, this rifle is a perfect choice for anyone! As an Amazon Associate I earn from qualifying purchases. A bullet with a high ballistic coefficient is slippery and less subject to drag (slowing down) as it continues on its merry way. RifleShooter Magazine editor Scott Rupp breaks down all the features of the Mossberg Patriot Predator rifle chambered in 6.5 PRC. It's often been compared to the 6.5 Creedmoor. Note that in the .308 pair, the heavier bullet (which has the greatest sectional density) has the better BC. It's when game such as elk, moose, caribou, mountain goats and the bigger bears are on the menu that bullet integrity becomes critical. A variation of the _gat cookie set by Google Analytics and Google Tag Manager to allow website owners to track visitor behaviour and measure site performance. BC is what determines trajectory and wind drift, other factors (velocity among them) being equal. doubleclick.net - browser supports cookies. Enfield No. Sign up to receive new product announcements, special offers, and the annual product catalog. The U.S. Army calls the round "next generation," and based on .277 Fury's capabilities, that is not an exaggeration. We have discussed how gravity and wind are the two main variables that affect your bullets path. Weve got a dedicated section for the AR-15 here. Hornady now publishes 200 yard Mach 2.25 (2,512 fps @ ICAO Standard Atmosphere**) G1 and G7 Ballistic Coefficient (BC) numbers for all A-Tip, ELD-X, and ELD Match bullets. . They are the ones to choose for long range shooting where a flatter trajectory is important. But the more streamlined bullets have a higher ballistic coefficient. On such heavy-bodied game animals, which are challenging to hunt and rarely offer a perfect broadside presentation, I'm a believer in using premium, heavy-for-caliber bullets. My next preferences is Sierra, Swift and Hornady. The BC-enhancing polymer tip initiates expansion, and the LRX deforms with four razor-sharp petals that create a large frontal diameter. Originally, those smart people who did a lot of testing on the range worked out predictive models for bullet flight based on that standard projectile shape. Why Is Knowing Your Rounds BC Important? Making those long range shots past a 1000+ nice! The higher the number the less drag, and the more efficiently the bullet cuts through the air. Starting all three bullets at a muzzle velocity of 3100 fps from a scoped 6mm rifle zeroed at 300 yards, the trajectories are as follows. Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Published Dec 17, 2019 5:47 PM EST, We may earn revenue from the products available on this page and participate in affiliate programs. Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. The Matchking has a coefficient of 0.417. This means that the speed and energy will vary from cartridge manufacturer to manufacturer. For example, a ping-pong ball is less dense than a marble. The 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. (Examples being rounds like the 30-30.). Much of your article is reinforcement of what I have gathered previously in several different articles. Some hunters prefer a solid copper or solid gilding metal bullet. These bullets will withstand high-velocity impact at close range and still deliver expansion at distances to and beyond 800 yards. 2023 Backfire LLC, a limited liability company headquartered in Utah, USA, 195gr Berger Extreme Outer Limits (EOL) Elite Hunter. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. 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. Instead search for the bullet on the top left using the search box or browse by rifle, or pistol using the links from the main menu. Spitzer, which means pointed, is a more efficient shape than a round nose or a flat point. With the right BC you can make a . 2-Reloading the real Pleasure of the shooting with math. Ballistic Coefficient is a bit of a new word when we look at the history of physics. If more than one bullet shoots equally well, then choose the one with the higher BC. It's like the humpty-dumpty or weeble of the .308 bullet world. The downside is, of course, inconsistent BC as velocity changes. Mach 2.0 (2,233 fps @ ICAO Standard Atmosphere) and Mach 1.75 (1,954 fps @ ICAO Standard Atmosphere) BC values are also available. Weight retention (175.9 grains) was a remarkable 98 percent, and the expanded bullet measured 0.69 inch, actually larger than at 50 yards. This cookie is set by GDPR Cookie Consent plugin. !, Next article-Brass how to choose which is better? gives us a very small window of the projectile/bullet's ability to overcome external factors such as wind and gravity. Take a look at the bullets themselves and what we learned. When it comes to hunting or defensive use, you need the bullet to be in a certain velocity range to ensure the expansion of the projectile when it hits a target. This system is a great way to compare cartridge systems so you can better make an informed purchase. . Available Calibers: 6.5mm, .277, 7mm, .308, and .338. is both capable and popular, especially on the heavy-bodied game where bullet performance becomes critical. To further assess the importance of a boat tail, note these pairs of Speer spitzer bullets of the same weight and caliber. Get the latest news and reviews from Gundigest.com. From front to back along the flight path, the quarter is only 0.069 inches long when its flying face first because thats the thickness of a quarter. Stock Dia. Youtube - Track the views of embedded videos. You also have the option to opt-out of these cookies. First Focal Plane vs. Second Focal Plane Scopes Explained: Which is Best? 1 Single-Shot Rifle: Tips to Improve Its Accuracy, Wilson Combat Paul Howe Tactical 6.5 Creedmoor: Full Review of the Versatility Champ, .45-70 vs .450 Bushmaster Cartridge Clash, 10 Great .22 Mag Bolt-Action Rifles Right Now, Sweet Scents of Gun Solvents and Oils: 12 Perfumes for Firearms, .375 H&H Mag. Let me hear from you in the comments below! 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. Back in the day, guys with lots of time on their hands fired boatloads of projectiles to figure out how they behaved in flight. It takes a lot of research and development and field research by a good team of engineers to design a bullet that will both expand and hold together through a wide range of velocities. To grossly abuse math and physics, bullets with high sectional density are long and skinny. Beth Shimanski of Savage introduces their all new straight-pull rifle. But opting out of some of these cookies may affect your browsing experience. guns & You might see different BC numbers for bullets at different velocity ranges. The skill, the math, and the equipment used are truly impressive. This was done to provide the most usable BC from a trajectory prediction standpoint. After spending some time with this database you will most likely find the bullet that best meets your needs. The nail flying point forward has a very high sectional density because its long and skinny. Not so long ago a Barrett or Cheytac was needed at a high price for shots out to a mile+. purchase helps support my work in bringing you more awesome gun and gear articles. However, you may visit "Cookie Settings" to provide a controlled consent. This is done so you have an accurate number that represents the bullets performance over long range. Quantserve sets the mc cookie to anonymously track user behaviour on the website. This cookie can only be read from the domain they are set on and will not track any data while browsing through other sites. Thats where it started, and since then its gone from simple experiments all the way to engineers and scientists at places like Aberdeen Proving Ground working to improve ballistic calculations.