7.62x39mm accuracy/bullet size   January 29, 2003, 11:12 PM Some
7.62x39mm ammo has a .308 bullet diameter, some a .311 bullet
diameter.  My barrel is .311 internal diameter, wondering how
firing the smaller bullet might affect accuracy. [rattling
around]  Or vice versa, firing the .311 bullet through a .308
bore. [squeeze]  I thought the external dimensions of commercial
ammo were standardized... it seems like a different bullet
diameter would be a different "caliber".  Anybody know why this
discrepancy exists?  But that's just me. I wonder if this is one
of those cases where "that's the great thing about standards,
there are so many of them !!"  If you enjoyed reading about
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today for the full version! Smokey Joe January 30, 2003, 02:33
AM I've just done the math, and 7.62mm does not equal .308". Nor
does it equal .311". These designations are done arbitrarily,
for a variety of reasons, and