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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Necking down and changing shoulder angle?
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<blockquote data-quote="4mesh063" data-source="post: 26719" data-attributes="member: 941"><p>Brent,</p><p></p><p>Your buddy Ken Markle doesn't like 40 degree shoulders. Give him a call. I agree.</p><p></p><p>Anyone have ideas/experience on this? </p><p>I'm going to change a 338 Lapua case to 30 cal and the new shoulder angle will be 40 degrees, giving it a .405" long neck. </p><p></p><p>Will a bushing type FL sizing die of Jim Cartensen's work fine for this simple change? </p><p></p><p>I've never seen Jims dies. You are going to do about what I do to my 416 case and what Ken does to his, just on a shorter scale. He moves his in a custom made arrangement in steps much like you mention, but, He supports the entire case when doing it. The short movement you propose on the neck and shoulder could give you trouble. It's actually easier to move a bunch than a little. </p><p></p><p>How many different sizes of bushings, or how far apart can one go with them and get great results?</p><p></p><p>I use a 2 piece die arrangement that I would not recommend to you for the distance you're going. FWIW, I START by moving .030 on a side. That's a ton but beleive it or not, it's the easiest move. Then I drop down to .024 on a side, then .018 and finally .015</p><p></p><p>If I had to do it over again, I would probably use a different gun! Seriously, I would probably go to .035/side on the first pass and go less on #2. The first one for you is gonna be easy because you already have the shoulder radius to begin with and that will go into the bushing very easy. After you do that though, the brass is harder and the next pass is pretty difficult. DO NOT anneal the brass for this as It will surely collapse the shoulder. </p><p></p><p>Be sure to make the last pass a small one because the concentricity of the brass will be dramatically better if you don't try to push so much on the final size. Beleive it or not, the brass will try to lean sideways when the lube is scraped off in the die on a heavy pass. It's about impossible to eliminate so just minimise it by getting one more bushing for a finish pass.</p></blockquote><p></p>
[QUOTE="4mesh063, post: 26719, member: 941"] Brent, Your buddy Ken Markle doesn't like 40 degree shoulders. Give him a call. I agree. Anyone have ideas/experience on this? I'm going to change a 338 Lapua case to 30 cal and the new shoulder angle will be 40 degrees, giving it a .405" long neck. Will a bushing type FL sizing die of Jim Cartensen's work fine for this simple change? I've never seen Jims dies. You are going to do about what I do to my 416 case and what Ken does to his, just on a shorter scale. He moves his in a custom made arrangement in steps much like you mention, but, He supports the entire case when doing it. The short movement you propose on the neck and shoulder could give you trouble. It's actually easier to move a bunch than a little. How many different sizes of bushings, or how far apart can one go with them and get great results? I use a 2 piece die arrangement that I would not recommend to you for the distance you're going. FWIW, I START by moving .030 on a side. That's a ton but beleive it or not, it's the easiest move. Then I drop down to .024 on a side, then .018 and finally .015 If I had to do it over again, I would probably use a different gun! Seriously, I would probably go to .035/side on the first pass and go less on #2. The first one for you is gonna be easy because you already have the shoulder radius to begin with and that will go into the bushing very easy. After you do that though, the brass is harder and the next pass is pretty difficult. DO NOT anneal the brass for this as It will surely collapse the shoulder. Be sure to make the last pass a small one because the concentricity of the brass will be dramatically better if you don't try to push so much on the final size. Beleive it or not, the brass will try to lean sideways when the lube is scraped off in the die on a heavy pass. It's about impossible to eliminate so just minimise it by getting one more bushing for a finish pass. [/QUOTE]
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Necking down and changing shoulder angle?
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