Quote:
MIL SPEC data shows about 90 fps slower bullets for the 7.62 cartridge compared to the 30 caliber one, both spec'd at 50,000 cup
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While I cannot personally vouch for the accuracy of the information, Cartridges of the World has listed this since the 1970s:
7.62mm NATO, Ball, M80
Velocity: 2750 +/- 30fps at 78 feet
Pressure: 50,000psi max avg
Bullet: 149-3 grs.
Caliber .30, Ball, M2
Velocity: 2740 +/- 30fps at 78 feet
Pressure: 50,000psi max avg
Bullet: 152 -3 grs.
To me, that's close enough not to matter in any practical way.
( if different sources show different data, is the difference enough to matter?)