Well you know, first things first.
memes
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A collection of some classic Lemmy memes for your enjoyment
Sister communities
- !tenforward@lemmy.world : Star Trek memes, chat and shitposts
- !lemmyshitpost@lemmy.world : Lemmy Shitposts, anything and everything goes.
- !linuxmemes@lemmy.world : Linux themed memes
- !comicstrips@lemmy.world : for those who love comic stories.
And by "Americans" you mean the companies that manufacture the firearms, right? Or whatever body, if any, that controls what size ammunition cartridges are measured by?
Both are used. If you see caliber after the number it's in 100 of an inch. If you see mm it's metric. (Though caliber refers to barrel diameter and can be expressed in imperial or metric). So a 45 caliber is 0.45 inches or about 11.5mm.
NATO has standardised on a few round types so they can share supplies between countries. The NATO 7.62×51mm round is very similar to the .308 and they can usually be interchanged.
They so stupid, they unconsciously use it everyday for example to calculate medicines' dosages or measuring time (miliseconds), it only shows how backwards and limited their measurement system really is.