Just one itty-bitty nit.
The 30-06 is 7.62X63.
The 7.62X54 you cited is the round for the Russian Mosin Nagant. (Yes - I’m a Mosin freak. Fireballs ‘R Us!)
Oops, my bad. Thanks.
Beat me to it (63mm).
And then there's 7.62x51, alias 7.62 NATO (used in M-14, FN-FAL, and other NATO rifles), alias .308 Winchester in civilian rifles.
