In response to:

California Democrat Decries 30-Caliber-Magazine-Clip-Guns in Stunning Display of Idiocy

CombatMissionary Wrote: Jan 21, 2014 12:36 PM
A .308 caliber and a 7.62 mm are BALLPARK .30 caliber. The 7.62 is roughly .311 caliber.
Pistol Wrote: Jan 21, 2014 7:02 PM
Hi Combat. To add to the confusion, the names of a cartridge do not necessarily correlate to the actual size of the bullet, and dimensions of the lands and grooves of the barrel through which the bullet is fired also apply. The Russian 7.62 x 39 uses a bullet (in the original) which nominally measures .311 inch if you put a micrometer on it. The American 7.62 x 51 and the Garand .30 government '06 also use a .308 bullet. The British call their old round the .303 British, but I understand it uses a nominal .311 ball. Things get more and more complex, for instance the .38 special and .357 Magnum both use a nominal .358 bullet. Handloaders who must buy the right size bullet for their reloads know very well you can't trust the name of a cartridge to describe the projectile.
rbarton Wrote: Jan 21, 2014 3:31 PM
I was hoping someone would say that.