As Hornady moves the industry to drag coefficient based trajectory calculations for these types of projectiles, the Ballistic Coefficient is becoming somewhat irrelevant. In the world of ballistic coefficients, a bigger number means that a bullet flies more efficiently. In addition to the change listed above, a select few ELD-X and ELD Match bullets initially had BC values that were determined from prototype bullets. Join F&S+ to read exclusive stories by your favorite writers. Even their ammo is great. As an example, a bullet can have a G7 BC of 0.279 above 3000 fps, but when averaged from 3000 fps to 1500 fps, the G7 BC is 0.273. Good question and its a controversial one. Slow-burning, temperature-stable propellants like H4831SC and . This Sierra Pro-Hunter is also a .308, 150-grain . 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. As Sectional Density is a key input to Ballistic Coefficient, well look at that first. The Matchking has a coefficient of 0.417. Personalize your experience. Both bullets for loading and ammo are available in 6mm, 6.5mm,. Mag., and .300 WSM.and as a component for handloaders. Weight. Punching holes in a target? It get that G1 is an average under 500 yds and G7 is an average over 500 yds up to sonic velocity when everything falls apart. Beth Shimanski of Savage introduces their all new straight-pull rifle. Click below for a FREE LESSON! For example, some manufacturers measure BCs over long range while others only provide BCs tested over short range. To illustrate the practical difference between these three styles of bullets, let's use Hornady's trajectory figures for the 100 grain 6mm bullets above. To show viewers how to succeed at long range, J. Guthrie gears up for a challenging shot while chasing Colorado pronghorn at long range with DPMS' Panther 6.5 Creedmoor. Some of the data that are collected include the number of visitors, their source, and the pages they visit anonymously. 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. The higher the number, the less drag the projectile will experience. Backfire LLC owns and operates this website. Ballistic Coefficient (BC) is basically a measure of how streamlined a bullet is; that is, how well it cuts through the air. As an Amazon Associate I earn from qualifying purchases. The skill, the math, and the equipment used are truly impressive. Long range shooters have to practice, and they must have consistent ammo to practice. Think about it this way: An arrow is more aerodynamically efficient than a tennis ball. If they penetrate only 12 or 14 inches (inhibited by that same massive frontal diameter that's causing such dramatic tissue destruction), that's usually adequate. 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. Mag., .308 Win, .30-06, .300 Win. 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 following is a 1000 yard .308 ballistic chart that was created using our free online ballistic calculator and details all aspects of the bullets trajectory from the millisecond it leaves the barrel until the time it reaches the 1,000 yd mark. Given that there is an infinite number of bullet types, weights, and shapes, doing all the math for each would be an impossible task. You also have the option to opt-out of these cookies. 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. google_ad_slot = "7610963244"; Mach 2.0 (2,233 fps @ ICAO Standard Atmosphere) and Mach 1.75 (1,954 fps @ ICAO Standard Atmosphere) BC values are also available. Making those long range shots past a 1000+ nice! Learn more . 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. google_ad_height = 90; The BC-enhancing polymer tip initiates expansion, and the LRX deforms with four razor-sharp petals that create a large frontal diameter. And the .300 Win. Article No. The 55-grain bullet provides a good balance between the light 40-grain and the heavy 77-grain bullets. Knowing ballistic coefficient allows you to calculate how far your round flies as it loses velocity. 2023 Outdoor Sportsman Group. Ballistic coefficient (the measurement of how easily the bullet passes through air) is a critical part of the equation, as well. Tips, techniques, and equipment are applied to these classroom discussions on how to become more proficient and successful at making long-range shots while hunting with AR-platform rifles. That boils down to more complex factors like shape, length, and weight distribution. AccuBond Long Range bullets will hold up to extreme, high-velocity impacts at close range, and still deliver expansion and penetration at crazy long distances. We'll only use the information provided according to our privacy policy. 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. Absolutely not. Scott Rupp gets a chance to talk to Aaron Oelger about a few new products from Hodgdon and why reloading store shelves are empty. The extent of how much a BC will change depends on each unique bullet shape. Thats way too complicated, so lets use an illustration. In the world of ballistic coefficients, a bigger number means that a bullet flies more efficiently. BC changes with the shape of the bullet and the speed at which the bullet is traveling, while sectional density does not. Lets design a standard bullet and do all the math for that one. For BC calculations, the shape of a bullet is compared to pre-determined drag models. The two most common drag models are G1 and G7. A bullet's efficiency is measured by its ballistic coefficient (BC). Speed and Energy are figured out using an average of all the known cartridges. Then youll repeat the process. This was done to provide the most usable BC from a trajectory prediction standpoint. These variables, which well discuss in the next column, can change each time and location you shoot. Type your new password and hit button below to confirm it. The best styles for long-range shooting will have high density and aerodynamically efficient shapes. Simply, large and light bullets are less dense than small and heavy ones. Due to the sensitivity of BCs to velocity, it can highly skew the comparison. Hunters who choose a 195 Berger EOL hunting bullet compared to a 140gr Nosler Accubondeven if both bullets are shot at 2,800fps would see 6 less drop and 8 less wind drift at 500 yards. A slower barrel twist of 1:10 is generally adequate to stabilize bullets weighing up to 100 grains, while the accuracy of heavier, higher ballistic coefficient bullets is improved by a 1:7 or 1:8 twist. As an extreme example, lets use water because it is easy to picture how much denser it is than air. This cookie is set by GDPR Cookie Consent plugin. That doesn't seem to be an overstatement, based on the Ballistic Coefficients (BC) WTC has published on this new line of bullets. The following at the most standardized: The G1 is the oldest and still the most commonly used. .257" (.25) 100 grain, BC .369.257" (.25) 100 grain BT, BC .393, .277" (.270) 130 grain, BC .408.277" (.270) 130 grain BT, BC .449, .308" (.30) 165 grain, BC .433.308" (.30) 165 grain BT, BC .477. Mach 1 = 1116.48 fps @ ICAO Standard Atmosphere). Someday maybe Ill have the time and money to play in the long range sweepstakes game one friend is regulalry hitting his targets at 800 yards, and often at 1000 yds.. me, Im happy at present if I can hit at a couple hundred yards Need more range time. ** Hornady BC values have been corrected back to International Civil Aviation Organization (ICAO) Standard Atmosphere (Sea Level, 59 degrees F, 29.92 inHg, 0% Humidity). 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. Hornady A-Tip. YouTube sets this cookie to store the video preferences of the user using embedded YouTube video. Ballistics is an odd, but fascinating science, and it can be intimidating to go too deep. Ballistic Coefficient is essentially a measure of air drag. Each one of these projectiles is engineered for tight groups at long range, By All BCs (G1 and G7) advertised by Berger Bullets are averaged from 3000 fps to 1500 fps. These projectiles even come with a polishing cloth. Instead, the BC is best used as a comparative number between different bullets.
