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Rifles, Reloading, Optics, Equipment
Reloading
Breaking in a new gun today…
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<blockquote data-quote="Mikecr" data-source="post: 2669033" data-attributes="member: 1521"><p>This is merely folklore Bob.</p><p>If necks expand 0.0000000001" it might as well be a mile. The bullet is swingin in the wind, fully released, and there is not 1fps difference from that and any other clearance.</p><p>Just think about it: why would there be a difference?</p><p></p><p>I've done some testing with a fitted chamber, just for the learning here. This, with a remote trigger, and a chronograph.</p><p>I went from normal 2thou clearance to essentially none (but no interference). It made no difference. If a neck can expand at all, it's sufficient.</p><p>So I ended up sticking with 1/2thou neck clearance. This provided room for a bit of loaded runout, which if high enough to cause a chambered pressure point, which could throw a shot.</p><p>Never a problem.</p><p></p><p>Also, the notions about 'pull force' are meaningless to bullet release.</p><p>The fact is: if your load had to push a bullet out of necks, the gun would blow up right there.</p><p>You could actually run into this, an interference fitting neck, if you don't mind a building carbon ring at chamber end.</p><p>As far as crimping case mouths into bullets? This could be dangerous with highly improved cartridges, regardless of clearances.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2669033, member: 1521"] This is merely folklore Bob. If necks expand 0.0000000001" it might as well be a mile. The bullet is swingin in the wind, fully released, and there is not 1fps difference from that and any other clearance. Just think about it: why would there be a difference? I've done some testing with a fitted chamber, just for the learning here. This, with a remote trigger, and a chronograph. I went from normal 2thou clearance to essentially none (but no interference). It made no difference. If a neck can expand at all, it's sufficient. So I ended up sticking with 1/2thou neck clearance. This provided room for a bit of loaded runout, which if high enough to cause a chambered pressure point, which could throw a shot. Never a problem. Also, the notions about 'pull force' are meaningless to bullet release. The fact is: if your load had to push a bullet out of necks, the gun would blow up right there. You could actually run into this, an interference fitting neck, if you don't mind a building carbon ring at chamber end. As far as crimping case mouths into bullets? This could be dangerous with highly improved cartridges, regardless of clearances. [/QUOTE]
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