Also wetsuits…? 🤷♀️
this post was submitted on 06 Jun 2025
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they would freak out if they have to measure temperature in kelvins, even celcius freaks americans out.
And the druggies. Somehow, they had no trouble switching to metric.
Priorities.
We all use metric. We need to just rip the bandaid off.
Hey, that's a win. I'll take it.
9mm Parabellum was designed by Austrian George Luger 10mm Auto was designed by FFV Norma AB of Sweden 5.56 NATO was developed in Belgium by FN Herstal, as was 5.7mm 7.62×39mm was developed by the Soviets
These European cartridges all use metric measurements
.223 Remington, .308 Winchester, .30-06 Springfield, .40 Smith & Wesson, .22lr, .357 Smith & Wesson Magnum, .44 Remington Magnum are all American made cartridges that use decimals of Imperial measurements Original designer’s name gets includes because, well, capitalism lol
I think one of the few exceptions might be 6.5mm Creedmoor, developed by Hornady
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Well you know, first things first.
It's like that because everyone else measures them that way, and capitalism. It's not even because it's a better system, it's because money.
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.
And when not, kablammo?!
You can fire .223 in a firearm rated for 5.56mm pressure
.308 is the opposite. It has more pressure than 7.62mm
Most any new barrel is going to be rated for both pressures now a days, but always good to doublecheck!