this post was submitted on 15 Feb 2025
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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.