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Ideally what you want is a full length bushing die manufactured to your chamber, not SAAMI spec. My last 1000 yd rifle came with a set of dies custom made for that chamber. In essence, it is a full length sizing die that is doing nothing but neck sizing. When using off the shelf dies, I have seen very little (if any) accuracy gained by neck sizing, and I have seen a lot of reliability loss due to neck sizing.
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