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Rifles, Reloading, Optics, Equipment
Reloading
Which Neck Sizer to use
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<blockquote data-quote="Trickymissfit" data-source="post: 581783" data-attributes="member: 25383"><p>if you have access to a few machines, I simply build my own die to rough in the case to size. I would make a series of bushings that had the shoulder angle machined on ne end, and the bore would be whatever I was after minus .003" for spring back. I'd probably take the neck down in three or four steps, and then finish it with a regular die. (should size the necks down .003 to .005"). You can buy hard steel bushings from a bearing reseller that will be about .100" wall thickness, and as hard as your ex wife's lawyer in court. They cut pretty easy with a ceramic insert. Of course you could also use drill bushings, but think they'll be too big in diameter. Or you could simply turn them out of A2 and have them hardened (A2 will not change during heat treat so machine to size). You can but the inner races in .312", 9mm, and .375" in various lengths. For the die body, I'd use 4150 pretreat steel, and run the chamber reamer thru it. Then cut the other end fr the bushings with a cap of some sort to hold them in place. Then after all this is done simply have it nitrided for a .025" case. (you might even be able to get by without nitride hardening being as all your doing is a neck and shoulder rework). I don't think I'd do this with a regular bushing die as I don't the the bushing retaining cap will be strong enough. You'll need something much heavier in construction. I kniow a guy that uses a similar setup to form 30 Meyer cases, and they are a bitch to form. He has to take .284 brass out to 35 caliber and then shrink the necks and push the shoulder back quite a bit. He does it in an arbor press.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 581783, member: 25383"] if you have access to a few machines, I simply build my own die to rough in the case to size. I would make a series of bushings that had the shoulder angle machined on ne end, and the bore would be whatever I was after minus .003" for spring back. I'd probably take the neck down in three or four steps, and then finish it with a regular die. (should size the necks down .003 to .005"). You can buy hard steel bushings from a bearing reseller that will be about .100" wall thickness, and as hard as your ex wife's lawyer in court. They cut pretty easy with a ceramic insert. Of course you could also use drill bushings, but think they'll be too big in diameter. Or you could simply turn them out of A2 and have them hardened (A2 will not change during heat treat so machine to size). You can but the inner races in .312", 9mm, and .375" in various lengths. For the die body, I'd use 4150 pretreat steel, and run the chamber reamer thru it. Then cut the other end fr the bushings with a cap of some sort to hold them in place. Then after all this is done simply have it nitrided for a .025" case. (you might even be able to get by without nitride hardening being as all your doing is a neck and shoulder rework). I don't think I'd do this with a regular bushing die as I don't the the bushing retaining cap will be strong enough. You'll need something much heavier in construction. I kniow a guy that uses a similar setup to form 30 Meyer cases, and they are a bitch to form. He has to take .284 brass out to 35 caliber and then shrink the necks and push the shoulder back quite a bit. He does it in an arbor press. gary [/QUOTE]
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