Muzzle velocity of ar 1512/7/2023 ![]() So in the case of a shorter barrel the bullet leaves the barrel quicker and is no longer being pushed by the explosive powder. As the bullet is propelled down the barrel it continues to gain speed until either the explosive expansion of the ignited powder maxes out or the bullet leaves the rifle. When the round is fired, the powder ignites causing a rapid expansion of gases and pressure behind the bullet. 223 55gr 3240 / 1282 2874 / 1008 2536 / 785 2222 / 603 6.8 drop at 300 How Does Barrel Length Affect Velocity?īarrel length plays an important aspect in determining the velocity of the round. This chart details the ballistics of ten different. Several series of tests will be conducted but each consists of a set of ten rounds with the average of these ten shots being the result. The tests must be conducted in temperatures between 60 and 80 degrees. 223 Remington the standard test requires a 24 inch barrel with a 1:12 twist. These guidelines dictate the number of rounds fired during the test, the barrel length, twist-rate and temperatures the tests are to be conducted at. They have a defined set of standards for testing each type of round and caliber that is based on a specific casing style. Testing of ammunition is regulated by SAAMI (Sporting Arms Ammunition Manufacturers Institute) standards. If velocity changes so much depending on barrel length and other factors then how did they come up with these numbers? Most ammunition produced in a factory will come with the foot per second listed on the label. So if that is the case then how can you determine an expected velocity from your rifle and ammo? This is true even when using two rounds with the same bullet weight from different manufactures as powder types and loads may be different. Velocity will vary depending greatly depending on the Ammo that you select. How is velocity calculated on factory produced ammo? ![]() ![]() The ammunition, bullet weight and powder load along with barrel material, coating, and twist-rate all affect this velocity. ![]() This translates into 1977 to 2147 miles per hour. 223 caliber round tends to be between 29 when fired from a 16 inch barrel with a 1:12 twist. Despite that some conclusions can be drawn based on testing that will enable you to determine an expected muzzle velocity range. When discussing muzzle velocities of any round it is important to note that everything from barrel length, barrel twist, compensators, barrel material and even the weather will affect the velocity to some extent. ![]()
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