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Old August 6, 2012, 01:18 PM   #2
FrankenMauser
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Join Date: August 25, 2008
Location: 1B ID
Posts: 6,650
The .204 cases, even if ejected as fast as you can manage, are in the chamber longer and transfer more heat to the chamber/barrel.
The .223 cases, on the other hand, are violently expelled from the AR just milliseconds after the bullet leaves the barrel. There is no time for the chamber to soak up the heat in the brass case.


Arguments could be made about different powders acting differently, as well; but the actual affect would be trivial.
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