this post was submitted on 01 Apr 2024
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Wait, not like that (lemmy.world)
submitted 8 months ago by [email protected] to c/[email protected]
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[โ€“] w2tpmf 3 points 8 months ago* (last edited 8 months ago) (1 children)

This isn't true. Both 5.56 and .223 can be loaded to a variety of pressure specs. 5.56 being hotter is fudd lore due to it being the military spec.

The difference between the two comes down to how the neck of the cartridge is measured. The the 5.56 is rated to withstand a certain pressure...it does not mean it is always loaded to a higher pressure.

The reason you don't want to shoot 5.56 in a .223 is because the cartridge neck doesn't fit the chamber properly and the resulting incorrect headspace is what can cause a catastrophic failure ..again it's not due to the round being hotter.