The firing of the primer moves the bullet into the rifling, before powder starts burning. The bullet pull is 35 lbs minimum, about .002" neck tension in 223.
https://apps.dtic.mil/dtic/tr/fulltext/u2/a622138.pdf
Should i worry about COL at all?
https://apps.dtic.mil/dtic/tr/fulltext/u2/a622138.pdf
Should i worry about COL at all?
5. Conclusions- By employing short-barrel guns, high-speed imaging, and the ARL primer force breech, extensive evaluations have been made into the initial motion, velocity, and acceleration of small-caliber projectiles in both 5.56 and 7.62 mm. These studies have shown that the primer output alone can greatly influence the initial motion of a small-caliber projectile. The primer is capable of producing enough force to debullet the projectile and begin the engraving process prior to any significant propellant burning.
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