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Rifles, Reloading, Optics, Equipment
Reloading
Sticking brass
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<blockquote data-quote="Mikecr" data-source="post: 2553434" data-attributes="member: 1521"><p>Whenever you're advised about needing more clearances, you should consider it bad advice.</p><p>More clearance is NEVER a fix in the long run. Especially if it's excess clearance that caused a problem to begin with.</p><p></p><p>This is how it works:</p><p>On firing a good stiff load the case expands to chamber everywhere. The chamber then expands some and your brass goes right with it. When load pressure drops the chamber and normal hardness brass springs back. If the brass does not spring back far enough you're left with an interference fit. This is seen as popping extraction with good extraction timing, or extraction failure with marginal timing.</p><p>Three additional factors in play here:</p><p>1. Lacking sufficient barrel steel around the chamber for the cartridge (chamber expands too much).</p><p>2. Poor breech support (breech end of chamber expands too much).</p><p>3. Excess clearances (brass expands too much).</p><p></p><p>Ultimately, with popping extraction, the brass had expanded too much. This, either because of the gun build, or excess sizing on your part.</p><p>'<em>Too Much</em>' means excess yielding.</p><p>Yielded brass does not ever spring back to a dimension that it was beforehand. Yielding also breaks grains in the metal, realigning with spring back to the last place it was (when yielded). That's why brass will go right back there on next firing (even with a reduced load and excess sizing). It's character changes.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2553434, member: 1521"] Whenever you're advised about needing more clearances, you should consider it bad advice. More clearance is NEVER a fix in the long run. Especially if it's excess clearance that caused a problem to begin with. This is how it works: On firing a good stiff load the case expands to chamber everywhere. The chamber then expands some and your brass goes right with it. When load pressure drops the chamber and normal hardness brass springs back. If the brass does not spring back far enough you're left with an interference fit. This is seen as popping extraction with good extraction timing, or extraction failure with marginal timing. Three additional factors in play here: 1. Lacking sufficient barrel steel around the chamber for the cartridge (chamber expands too much). 2. Poor breech support (breech end of chamber expands too much). 3. Excess clearances (brass expands too much). Ultimately, with popping extraction, the brass had expanded too much. This, either because of the gun build, or excess sizing on your part. '[I]Too Much[/I]' means excess yielding. Yielded brass does not ever spring back to a dimension that it was beforehand. Yielding also breaks grains in the metal, realigning with spring back to the last place it was (when yielded). That's why brass will go right back there on next firing (even with a reduced load and excess sizing). It's character changes. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sticking brass
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