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Rifles, Reloading, Optics, Equipment
Reloading
Annealing winchester 300WSM brass.
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<blockquote data-quote="Brent" data-source="post: 57854" data-attributes="member: 99"><p>There's a tight spot (thicker brass, a doughnut) that forms at the neck shoulder juncture and this is why Ken sells a fluted carbide reamer / mandrel for the K&amp;M turner. This heavily supported area will also spring back more than the rest of the unsupported neck as it resists expanding much more and always be tight, even from the factory. Once cut with the carbide reamer mandrel necks will not pinch the bullets if seated that deeply, or the normal mandrel when neck turning. The reamer mandrels are all I use and they work great... $35 I think.</p><p></p><p>If you run the expandiron mandrel into the neck of a annealed case and one that is not annealed, you will only get a consistant ID afterward for your neck turning mandrel to run on if the case neck was first uniform in support, hardness, thickness etc. The additional support given by the shoulder will always leave the ID in the neck/shoulder juncture tighter when expanding it, always. Lowering the blades on the caliper deeper and deeper into the neck will easily reveal the difference in ID and location it begins to get tighter. </p><p></p><p>I would guess that if the neck turning mandrel fit through the neck/shoulder juncture, it was fitting looser above this point... which is not desirable for consistant neck thickness.</p></blockquote><p></p>
[QUOTE="Brent, post: 57854, member: 99"] There's a tight spot (thicker brass, a doughnut) that forms at the neck shoulder juncture and this is why Ken sells a fluted carbide reamer / mandrel for the K&M turner. This heavily supported area will also spring back more than the rest of the unsupported neck as it resists expanding much more and always be tight, even from the factory. Once cut with the carbide reamer mandrel necks will not pinch the bullets if seated that deeply, or the normal mandrel when neck turning. The reamer mandrels are all I use and they work great... $35 I think. If you run the expandiron mandrel into the neck of a annealed case and one that is not annealed, you will only get a consistant ID afterward for your neck turning mandrel to run on if the case neck was first uniform in support, hardness, thickness etc. The additional support given by the shoulder will always leave the ID in the neck/shoulder juncture tighter when expanding it, always. Lowering the blades on the caliper deeper and deeper into the neck will easily reveal the difference in ID and location it begins to get tighter. I would guess that if the neck turning mandrel fit through the neck/shoulder juncture, it was fitting looser above this point... which is not desirable for consistant neck thickness. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Annealing winchester 300WSM brass.
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