[PhilipFreneau]

>>>They are all pretty much varients of your standard .30 cal round with various case lengths, bullet weights, and powder loads .30, .30-06, .308, 7.62x54R, and the .30-30 are the more common types.<<<

I believe all of those use the .308 caliber bullets, except for the Russian (7.62x54R) which uses a slightly larger caliber (.311 I believe).

[Dead Corpse]

Nope. They are all .30. The 7.62 in the diameter of the bullet in mm. 7.62mm =.3".

The same 150gr boattails I load in my .30-30 are the same ones you load for the .308Win and the .30-06. Look up a bullet manufacturer like Speer. You won't find a ".311" bullet listed. Just .30cal. Some do give bullet dimensions, most go by common caliber name.

10mm and .40S&W pistol shoot the same bullet.