Quote:
Originally Posted by JJ_BPK
Old School used to say over 3000 FPS. The 3K clip had to do with the steel used in barrels and its lack of ability to withstand the pressure and wear.
Found one SIG Fury 6.8x51 pic talking ballistics.
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Found the Army Definition finally
hypervelocity (A)
1. Muzzle velocity of an artillery projectile of 3,500 feet per second or more. 2. Muzzle velocity of a small arms projectile of 5,000 feet per second or more. See also high velocity. 3. Muzzle velocities of tank cannon projectiles in excess of 3,350 feet per second.
Source old AR 310-25
Guess they lowered the standards a little from 1985.