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Wrench spinner
Joined: Thu Oct 5th, 2017
Location: Leigh On Sea
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A steady diet of IMI will shorten the life of a barrel. Max pressure loads put a lot of stress on the internals. They also usually run hotter and a hot barrel will wear more because of the thermal expansion. A barrel that is slugged at .223" will shrink in size as it gets hot and the metal expands. The hotter it gets the smaller it will become. A bullet that is .224" develops a lot more pressure exiting a .222" barrel.
Really? Does the barrel only heat on the internal surface or does the metal get uniformly hot - having never even seen a gun, I have no idea!
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