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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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<blockquote data-quote="Buck Fever" data-source="post: 2765051" data-attributes="member: 113501"><p>A benchrest shooter is going to be running a tight chamber and headspace near 0.000". His brass shouldn't move much when firing and shouldn't move much when full length sizing.</p><p></p><p>I also think the sizing 1/2 the neck just helps when the necks are too thin so the bulge centers the case when chambering.</p><p></p><p>Another thing benchrest shooters always do is anneal between loadings. Softening the brass lets it flow evenly when sizing and firing. Brass that has been work hardened too much gets brittle. </p><p></p><p>Now if you have a loose chamber and full length size back to SAAMI spec, the brass could be moving a lot. Since it headspaces off the belt, you might never know that's happening.</p><p></p><p>That's the reason why I don't have any belted magnums and probably won't go there.</p><p></p><p>I don't mind a multi-step case sizing so I have a body die for my 338 RUM and a Lee collet neck sizer. That lets me adjust shoulder bump independently and since it headspaces on the shoulder, I can see how much the brass is moving with my case comparator.</p><p></p><p>You could do the same with a belted Magnum, it just takes a bit more measuring if you are trying to headspace off the belt.</p><p></p><p>If you do size for a loose chamber, make sure those rounds don't wind up in a gun with a tight chamber...</p></blockquote><p></p>
[QUOTE="Buck Fever, post: 2765051, member: 113501"] A benchrest shooter is going to be running a tight chamber and headspace near 0.000". His brass shouldn't move much when firing and shouldn't move much when full length sizing. I also think the sizing 1/2 the neck just helps when the necks are too thin so the bulge centers the case when chambering. Another thing benchrest shooters always do is anneal between loadings. Softening the brass lets it flow evenly when sizing and firing. Brass that has been work hardened too much gets brittle. Now if you have a loose chamber and full length size back to SAAMI spec, the brass could be moving a lot. Since it headspaces off the belt, you might never know that's happening. That's the reason why I don't have any belted magnums and probably won't go there. I don't mind a multi-step case sizing so I have a body die for my 338 RUM and a Lee collet neck sizer. That lets me adjust shoulder bump independently and since it headspaces on the shoulder, I can see how much the brass is moving with my case comparator. You could do the same with a belted Magnum, it just takes a bit more measuring if you are trying to headspace off the belt. If you do size for a loose chamber, make sure those rounds don't wind up in a gun with a tight chamber... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Sizing Vs. Full Length Sizing and Neck Tension
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