SC Tiger Posted July 8, 2020 Share Posted July 8, 2020 Looking at reloading dies, I notice that MidwayUSA doesn't show any for 5.56mm (at least in the RCBS dies). They do have a .223. This got me wondering - are the dies interchangable? I know a 5.56 rifle can fire .223 but a .223 shouldn't be used to fire 5.56, but does this also extend to the dies? Link to comment Share on other sites More sharing options...
LostinTexas Posted July 8, 2020 Share Posted July 8, 2020 (edited) IIRC the operating (chamber) pressure it the difference. Edited July 8, 2020 by LostinTexas Link to comment Share on other sites More sharing options...
SC Tiger Posted July 8, 2020 Author Share Posted July 8, 2020 4 minutes ago, LostinTexas said: IIRC the operating (chamber) pressure it the difference. That's my understanding - the outer dimensions of the round are the same but the pressure and chamber dimensions are different due to higher pressures. But I wanted to make sure. Link to comment Share on other sites More sharing options...
LostinTexas Posted July 8, 2020 Share Posted July 8, 2020 Just now, SC Tiger said: That's my understanding - the outer dimensions of the round are the same but the pressure and chamber dimensions are different due to higher pressures. But I wanted to make sure. I don't recall ever seeing 5.56 dies. That doesn't mean they don't exist, but 223 has worked fine. Link to comment Share on other sites More sharing options...
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