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Rifles, Reloading, Optics, Equipment
Reloading
Ideal case web sizing?
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<blockquote data-quote="Mikecr" data-source="post: 2776729" data-attributes="member: 1521"><p>I wouldn't say that. I don't think there is anything wrong with SAAMI max.</p><p>I'm talking about excess clearances.</p><p></p><p>With any new setup (chamber/brass), I run a test for what I call [MyMax]. This is with brand new brass.</p><p>I'm also shooting across a chronograph to validate along with QuickLoad predictions that I'm not out of control or anything.</p><p>I incrementally load upward, 1 shot each, with cases that I've culled (probably thickness variance).</p><p>What I measure is the widest diameter of the case. The 'web-line'. I'll see it go up, level off, and then step change upward again.</p><p>This step change point is MyMax. And it is the point where body sizing will be required for reloading.</p><p>With all but one of my setups, as best as I can tell, MyMax has matched SAAMI max.</p><p>That's important to me because I do not and never will FL size brass.</p><p></p><p>With my latest cartridge, a 26wssm Imp, I went fitted chamber. That is no more clearance than 1thou from new case dimension (anywhere). For lower case body and neck I went 1/2thou total clearance. That's plenty really, and it raised MyMax to ~75Kpsi by Quickload. SAAMI max for the wssm line is 65Kpsi, and it happens that my chosen mid-node is right there.</p><p>I now have over 80 reloads on my wssm cases with no body or neck sizing at all. There are no issues, and since I don't size I don't trim or anneal. So the brass will last forever from this chamber.</p><p></p><p>You may chose a different sizing plan. Something less extreme.</p><p>But I can suggest that my <em>thinking</em> brings way less work, causing fewer problems.</p><p>It's already well adopted in many industries. Like for example, it's the reason why engines and oil last so much longer today.</p><p>But THIS industry, reloading, has not evolved.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2776729, member: 1521"] I wouldn't say that. I don't think there is anything wrong with SAAMI max. I'm talking about excess clearances. With any new setup (chamber/brass), I run a test for what I call [MyMax]. This is with brand new brass. I'm also shooting across a chronograph to validate along with QuickLoad predictions that I'm not out of control or anything. I incrementally load upward, 1 shot each, with cases that I've culled (probably thickness variance). What I measure is the widest diameter of the case. The 'web-line'. I'll see it go up, level off, and then step change upward again. This step change point is MyMax. And it is the point where body sizing will be required for reloading. With all but one of my setups, as best as I can tell, MyMax has matched SAAMI max. That's important to me because I do not and never will FL size brass. With my latest cartridge, a 26wssm Imp, I went fitted chamber. That is no more clearance than 1thou from new case dimension (anywhere). For lower case body and neck I went 1/2thou total clearance. That's plenty really, and it raised MyMax to ~75Kpsi by Quickload. SAAMI max for the wssm line is 65Kpsi, and it happens that my chosen mid-node is right there. I now have over 80 reloads on my wssm cases with no body or neck sizing at all. There are no issues, and since I don't size I don't trim or anneal. So the brass will last forever from this chamber. You may chose a different sizing plan. Something less extreme. But I can suggest that my [I]thinking[/I] brings way less work, causing fewer problems. It's already well adopted in many industries. Like for example, it's the reason why engines and oil last so much longer today. But THIS industry, reloading, has not evolved. [/QUOTE]
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Ideal case web sizing?
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