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Not challenging your wisdom, oh great slayer of the kokanee, but....When turning .223/5.56 brass into 300 blackout brass isn't it possible that the thickness of the neck walls will be greater than factory new 300 blackout brass due to necking down? Maybe it doesn't matter? Enough room in the chamber?
What DizzyJ said to boot.
Well that's why correct conversions are always checked for the specific "GO" headspace brass and not the "NO GO" headspace brass....
Some stuff on the inteweb IS true...