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Actually, the only way that you are going to be able to solve your problem is by determining your exact chamber dimensions (you just don´t want to know all the differences in chamber sizes for this caliber that exist in all the guns manufactured and chambered in this caliber- even by the the same manufacturer!) and from this information choosing a correct case length that will allow you to head-space on the case mouth. Roll crimp is a no-no for this caliber, even with cast bullets.
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