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What is the neck diameter of a loaded .243 round...?

Most typical brass and typical bullts measure out at .271-.272 loaded ...I like a .275" NK for a good no turn dim...,SAMMI spec is .276")...the best thing is for you to measure your own loaded dims....they vary from lot to lot and brand to brand...of bullet and brass...not trying to be a wise guy....you just got to measure your own...hope this helps...Roger
 
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