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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity/Neck Turning/Culling Cases:
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<blockquote data-quote="Susquatch" data-source="post: 1750582" data-attributes="member: 31264"><p>At first, I read your post and my heart skipped a beat. Has Sinclair developed a mandrel based neck sizer? </p><p></p><p>So I went looking and only found the neck turning equipment that I have been using for a very long time. </p><p></p><p>The mandrel you mention isn't really a neck die. It is a tool that is used to size the neck prior to neck turning. When paired with Sinclair's neck turning tools, the mandrel produces a neck of the perfect inside diameter to provide optimum clearance for the Sinclair outside neck turning tool. </p><p></p><p>Although I am absolutely certain that it can be used to size necks for reloading, I really don't think it's ideal for that purpose. </p><p></p><p>The Sinclair mandrel and associated mandrel holder dies do not support the case in any way at all. The case basically sits unsupported in the holder die and the mandrel floats around a bit such that it can self center on the neck. In a perfect world maybe this works. But we don't live in a perfect world. Any irregularities in the case base or neck hardness profile will result in a significant loss of concentricity. </p><p></p><p>I do agree that it would eliminate the dreaded donut.</p><p></p><p>However, in my opinion, you would be better off using your mandrel die before turning necks (as per its design intent) and then using a competition bushing die (either in-line die or sliding sleeve) to size your necks. I don't believe there is any benefit to the extra step you are currently using, and I think you may actually be making things worse. </p><p></p><p>That's just my opinion. I would add that I've never heard of anyone in the winner circle at rifle competitions who sizes their necks that way. If it worked, they would all be doing it! </p><p></p><p>That said, I would also add that it is not unsafe and might be better than using standard (non-sliding) sizer. </p><p></p><p>Each to his own - your mileage may vary.</p></blockquote><p></p>
[QUOTE="Susquatch, post: 1750582, member: 31264"] At first, I read your post and my heart skipped a beat. Has Sinclair developed a mandrel based neck sizer? So I went looking and only found the neck turning equipment that I have been using for a very long time. The mandrel you mention isn't really a neck die. It is a tool that is used to size the neck prior to neck turning. When paired with Sinclair's neck turning tools, the mandrel produces a neck of the perfect inside diameter to provide optimum clearance for the Sinclair outside neck turning tool. Although I am absolutely certain that it can be used to size necks for reloading, I really don't think it's ideal for that purpose. The Sinclair mandrel and associated mandrel holder dies do not support the case in any way at all. The case basically sits unsupported in the holder die and the mandrel floats around a bit such that it can self center on the neck. In a perfect world maybe this works. But we don't live in a perfect world. Any irregularities in the case base or neck hardness profile will result in a significant loss of concentricity. I do agree that it would eliminate the dreaded donut. However, in my opinion, you would be better off using your mandrel die before turning necks (as per its design intent) and then using a competition bushing die (either in-line die or sliding sleeve) to size your necks. I don't believe there is any benefit to the extra step you are currently using, and I think you may actually be making things worse. That's just my opinion. I would add that I've never heard of anyone in the winner circle at rifle competitions who sizes their necks that way. If it worked, they would all be doing it! That said, I would also add that it is not unsafe and might be better than using standard (non-sliding) sizer. Each to his own - your mileage may vary. [/QUOTE]
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