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Rifles, Reloading, Optics, Equipment
Reloading
Ideal case web sizing?
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<blockquote data-quote="Mikecr" data-source="post: 2776504" data-attributes="member: 1521"><p>If his chamber fit is ok, he should not be sizing, or trying to size further.</p><p></p><p>A tip that rides counter to common thinking: The solution IS NEVER 'more' clearance.</p><p>In truth, excess clearance is usually the source of problems.</p><p></p><p>From what I've seen, factory/saami chambers are sloppy by 2thou clearance at webs. My chambers are tighter,, I never FL size (anything),, and I never have chambering/extraction issues. I also don't ever have to replace cases for loosening pockets, or for any other reason.</p><p></p><p>To me, this is gross problem. Reamer print says .588, new brass measures .579 (9thou clearance!). Stop right there.</p><p>There is no chance of NOT having a problem. Imagine running with 9thou of headspace, or of neck clearance. Do you think that would work? Not for long!</p><p></p><p>Even thick/large diameter web brass yields by 1.5thou, and goes full plastic by 2thou. It might as well be tin foil by 3thou.</p><p>It doesn't spring back from there, leaving an interference fit (popping extraction). So you're then forced to size it, but if you restore big clearances again, with big sizing, you're hardening the hell out of that brass, and it wants to go right back where it's been. It will, and the brass will keep moving and you'll end up with extraction issues again, if not case head separation, or pockets too loose for use..</p><p></p><p>With that much change, you're really forming a new cartridge all together.</p><p>So whether forced to do that or chosen, it should be handled like a wildcat forming.</p><p>My advice; continue fire forming, with minimal or no sizing, until you hit chamber dimensions. Then send some of that brass (unsized) to a custom die maker. Tell him what clearances you want, where. With web area brass, I would accept no more than 1thou clearance after sizing. This at least tries to get brass operating within elasticity (it's spring back), from it's new dimension.</p><p>If that don't/won't work, and I doubt it will from that much clearance, replace the barrel with a better chamber.</p><p>Stop killing brass and wasting time with it.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2776504, member: 1521"] If his chamber fit is ok, he should not be sizing, or trying to size further. A tip that rides counter to common thinking: The solution IS NEVER 'more' clearance. In truth, excess clearance is usually the source of problems. From what I've seen, factory/saami chambers are sloppy by 2thou clearance at webs. My chambers are tighter,, I never FL size (anything),, and I never have chambering/extraction issues. I also don't ever have to replace cases for loosening pockets, or for any other reason. To me, this is gross problem. Reamer print says .588, new brass measures .579 (9thou clearance!). Stop right there. There is no chance of NOT having a problem. Imagine running with 9thou of headspace, or of neck clearance. Do you think that would work? Not for long! Even thick/large diameter web brass yields by 1.5thou, and goes full plastic by 2thou. It might as well be tin foil by 3thou. It doesn't spring back from there, leaving an interference fit (popping extraction). So you're then forced to size it, but if you restore big clearances again, with big sizing, you're hardening the hell out of that brass, and it wants to go right back where it's been. It will, and the brass will keep moving and you'll end up with extraction issues again, if not case head separation, or pockets too loose for use.. With that much change, you're really forming a new cartridge all together. So whether forced to do that or chosen, it should be handled like a wildcat forming. My advice; continue fire forming, with minimal or no sizing, until you hit chamber dimensions. Then send some of that brass (unsized) to a custom die maker. Tell him what clearances you want, where. With web area brass, I would accept no more than 1thou clearance after sizing. This at least tries to get brass operating within elasticity (it's spring back), from it's new dimension. If that don't/won't work, and I doubt it will from that much clearance, replace the barrel with a better chamber. Stop killing brass and wasting time with it. [/QUOTE]
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Ideal case web sizing?
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