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The only thing measured in grams in the US is cannabis.
And bullets are measured in millimeters
It depends. Ones designed in other countries, yes. But if the bullet was designed in the USA, it is measured in inches like .45 ACP or .223 Remington
TIL that .223 Remington and 5.56x45mm NATO are very similar but not identical cartridges. Weird!
They aren't identical but the cartridge is so similar they can be used interchangeably.
This is dangerous.
TL;DR:
You can use .223 Remington in a rifle built for 5.56x45
You should never use 5.56x45 in a rifle chambered for .223 Remington
Are you worried about the pressure? The round will absolutely feed.
Yes, of course I'm worried about the pressure.
You can also feed and fire a .300 blackout in a 5.56 rifle/barrel, it will just destroy the weapon, and maybe your body if you're not lucky.
Yeah, that comes down to knowing your weapon. You can always over load the powder.
I thought Americans loved their fractions too much for those numbers.
The only ones who like fractions are carpenters. If you bring fractions into a machine shop then you're going to get a wrench hucked at you. Mechanics on the other hand keep the peace using fractions for fasteners and decimals for tolerances.
I'm on record multiple times on this platform saying I prefer to work in fractional inches in the wood shop specifically. It's well suited to the tasks you end up actually doing while building furniture. If you wanted me to build a car, I'd do it in metric.
Ok, I think I was still thinking about recipes but that is still way more than I'm used to and so arbitrary.
I think most medicines are measured in grams over there too (500mg for acetaminophen / paracetamol). And Cocaine.
Weed is measured in both!
Cocaine is one hell of a measurement.
It's actually sold in ounces. And grammes. My local head shop does that.
In Russia, cannabis was measured in "matchboxes" (around the amount that gets in to a small ziploc) and "glasses", where glass is a 220ml glass Russians drink vodka from in the movies.
So it goes full circle when you start measuring cannabis in glasses, sounds really American!