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Rifles, Reloading, Optics, Equipment
Reloading
7mm-300WSM wildcat
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<blockquote data-quote="Pdvdh" data-source="post: 269022" data-attributes="member: 4191"><p>I don't have your cartridge but I've necked down quite a few cartridge cases over the years.</p><p></p><p>The first question is easy. Neck it down to 7mm before outside neck turning. There's no way to know that the case neck would size down uniformly if you outside neck turned the 300 first and then necked it down.</p><p></p><p>You should be able to neck down from 300 to 7mm in one step without causing any problem. I would anneal the case neck after sizing it down, personally, just in case the neck hardened some during the size down process. Whether you anneal before or after outside neck turning the 7mm neck, I don't believe it would make much difference. </p><p></p><p>I wouldn't inside neck ream at all. If at the time you ouside neck turn you cut back into the shoulder just a tad (that's what I do with my K&M Services outside neck tuning tool), you shouldn't ever form any dougnuts. The K&M Services cutter is angled at 35 or 40 degrees where the cutter contacts the shoulder to allow a slight thinning of the shoulder brass. Upon firing the case in the chamber that cut is blown to the outside of the case - leaving a slight recess on the inside of the case neck where the doughnut might otherwise eventually form.</p><p></p><p>Hope this makes sense and helps. That's the way I would do it. Someone else that has this specific wildcat may have keener insights on this specific cartridge case, but I believe this advice to be sound for your wildcat too.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 269022, member: 4191"] I don't have your cartridge but I've necked down quite a few cartridge cases over the years. The first question is easy. Neck it down to 7mm before outside neck turning. There's no way to know that the case neck would size down uniformly if you outside neck turned the 300 first and then necked it down. You should be able to neck down from 300 to 7mm in one step without causing any problem. I would anneal the case neck after sizing it down, personally, just in case the neck hardened some during the size down process. Whether you anneal before or after outside neck turning the 7mm neck, I don't believe it would make much difference. I wouldn't inside neck ream at all. If at the time you ouside neck turn you cut back into the shoulder just a tad (that's what I do with my K&M Services outside neck tuning tool), you shouldn't ever form any dougnuts. The K&M Services cutter is angled at 35 or 40 degrees where the cutter contacts the shoulder to allow a slight thinning of the shoulder brass. Upon firing the case in the chamber that cut is blown to the outside of the case - leaving a slight recess on the inside of the case neck where the doughnut might otherwise eventually form. Hope this makes sense and helps. That's the way I would do it. Someone else that has this specific wildcat may have keener insights on this specific cartridge case, but I believe this advice to be sound for your wildcat too. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm-300WSM wildcat
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