Primer Output and Initial Projectile Motion for 5.56- and 7.62-mm Ammunition

Report No. ARL-TR-7479
Authors: John J Ritter; Richard A Beyer
Date/Pages: September 2015; 28 pages
Abstract: A novel technique for quantifying the initial motion of projectiles in unmodified small-caliber ammunition (5.56 and 7.62 mm) is demonstrated. Evidence that the primer launches the bullet into the engraving process prior to propellant burning is presented. The impulse resulting from the primers' (Nos. 41 and 34, respectively) output is measured and compared with the bullet momentum. Values for velocity and acceleration at early time are reported. Other consequences of the accurate measurements of the motion and associated pressure include comparing work done on the bullet to the kinetic energy as a function of position or time. The work presented here is a more-thorough account, along with minor corrections, of results presented at the 28th International Symposium on Ballistics.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2015