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Fine tuning loads lee factory crimp die
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<blockquote data-quote="JDD" data-source="post: 1641609" data-attributes="member: 102774"><p>You're right about data from what is need in a AR type rifle not being pertinent to this discussion. I have had ar's that would shoot bug hole groups if loaded one at a time with out using the mag. same gun and loads feed from the magazine barely a moa. Neck thickness, stiffness and degree of crimp are more about stopping damage during the loading process. I image that the relationship of the upper to the lower, how high the mag sits , the shape of the mag lips and spring tension and were that round sits in the stack can all have a bearing on the loading process and how much runout can be induced during the loading cycle.</p><p></p><p></p><p>This whole discussion comes down to neck tension, my plan is to test benchrest prepped case with neck tension adjustment due to different bushing size. .003 .004 neck reduction measured runout noted. compared to same brass using minimal neck sizing along with a light crimp induced by a collet run out noted . then to fire said brass multiple times to determine when annealing may be required again to determine if crimping reduces the need to anneal.</p></blockquote><p></p>
[QUOTE="JDD, post: 1641609, member: 102774"] You're right about data from what is need in a AR type rifle not being pertinent to this discussion. I have had ar's that would shoot bug hole groups if loaded one at a time with out using the mag. same gun and loads feed from the magazine barely a moa. Neck thickness, stiffness and degree of crimp are more about stopping damage during the loading process. I image that the relationship of the upper to the lower, how high the mag sits , the shape of the mag lips and spring tension and were that round sits in the stack can all have a bearing on the loading process and how much runout can be induced during the loading cycle. This whole discussion comes down to neck tension, my plan is to test benchrest prepped case with neck tension adjustment due to different bushing size. .003 .004 neck reduction measured runout noted. compared to same brass using minimal neck sizing along with a light crimp induced by a collet run out noted . then to fire said brass multiple times to determine when annealing may be required again to determine if crimping reduces the need to anneal. [/QUOTE]
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Fine tuning loads lee factory crimp die
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