Quote:
Originally Posted by MadMorbius
Technically incorrect. For all intents and purposes, the rounds are *generally* interchangeable but there are differences in the freebore diameter, freebore length and angle of the throat.
You can generally use them interchangeably.
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Exactly. They started out as a measurement. Now .223 and .308 are names for a
specification. There are many different specs of 5.56 and 7.62.