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Rifles, Reloading, Optics, Equipment
Gunsmithing
7PRC AW spec reamer?
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<blockquote data-quote="Jud96" data-source="post: 3092816" data-attributes="member: 69478"><p>The issue is the brass is too close in size to the SAAMI chamber at the base dimension. When you fire it, it can't really expand because it fits so tight. Then when you size the brass the die doesn't do anything because the brass didn't change dimension much at the base. If you make the die smaller, it can crack the die because you're trying to size down the thick solid case head that was too big to start. So since the brass doesn't get sized and doesn't expand it work hardens at the case head. With the AW reamers, the brass has room to expand outwards some and then the die can size it back down. The brass needs room to grow so then it can be sized down enough so it doesn't prematurely work harden. Others may be able to explain it better or have a better understanding of it, but that's my interpretation of the issues. Hornady should have spec'd the reamer .002 bigger at the 0.200 line on the reamer, or spec'd the brass .002 smaller at the base.</p><p></p><p>Edit to add, this isn't just a PRC problem. People have been fighting this for years with other reamers, dies, brass, etc. If you spec any reamer too small compared to the brass, you'll have this problem. If it's too big you can lose primer pockets prematurely. It's all a balancing act.</p></blockquote><p></p>
[QUOTE="Jud96, post: 3092816, member: 69478"] The issue is the brass is too close in size to the SAAMI chamber at the base dimension. When you fire it, it can't really expand because it fits so tight. Then when you size the brass the die doesn't do anything because the brass didn't change dimension much at the base. If you make the die smaller, it can crack the die because you're trying to size down the thick solid case head that was too big to start. So since the brass doesn't get sized and doesn't expand it work hardens at the case head. With the AW reamers, the brass has room to expand outwards some and then the die can size it back down. The brass needs room to grow so then it can be sized down enough so it doesn't prematurely work harden. Others may be able to explain it better or have a better understanding of it, but that's my interpretation of the issues. Hornady should have spec'd the reamer .002 bigger at the 0.200 line on the reamer, or spec'd the brass .002 smaller at the base. Edit to add, this isn’t just a PRC problem. People have been fighting this for years with other reamers, dies, brass, etc. If you spec any reamer too small compared to the brass, you’ll have this problem. If it’s too big you can lose primer pockets prematurely. It’s all a balancing act. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
7PRC AW spec reamer?
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