Geronimo45
Member
Let's tell him about 9mm.why? why does it have to be so complicated
A rifle in .308 Winchester or 7.62x51 can't shoot 7.62x39.
.308 and 7.62x51 have some differences in pressures (IIRC), but are more or less identical.
The .303 British is not .303. It's .311-ish.
The .38 Special is not .38. It's .355.
So is the 9mm Luger/Parabellum/NATO.
And the .380.
The .44 Magnum is not .44.
Finally, the Colt .45 (popular name for either the SAA revolver or 1911 pistol) is not Colt 45 (the Billy Dee Williams variety) and neither is .45 Colt (cartridge).