this post was submitted on 15 Feb 2025
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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.
Edit: https://youtu.be/RbfIkaNlECo?t=127
Yeah, that comes down to knowing your weapon. You can always over load the powder.