• Bronze
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I’ve been working with neck tension a bit in my .223. I found that it likes more than less. By that I mean, I size my cases and use a M type expander that measures .222″. I also have an expander that measures .224″, but the groups were noticeably different with that tension. My bullets are sized a bit over .225″(probably .2255″).

So I would not be set on a particular size, but try different sizes and see how it effects things.

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