I posed this question on another thread but it may have become lost in the other discussions. So, I’ll ask it here:
Regarding the various metric designations for US cartridges, are there published official listings of them? The US designations can be found in the TMs that are available with a little on-line searching, but what about other countries? For example, where do I find a drawing of the 12.7 x 76mm (or 77mm) and it’s official designation? Is it officially referred to as the “BAT” cartridge? Etc. Etc.