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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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<blockquote data-quote="Bart B" data-source="post: 748643" data-attributes="member: 5302"><p>Your avid shooter doesn't understand how a rimless bottleneck case fits the chamber when it's in there with the bolt closed and especially when its fired. But then, neither to most other shooters understand this.</p><p></p><p>When chambered, if the bolt's got an in line ejector, that pushes the round full forward into the chamber where its shoulder centers in the chamber shoulder. Its back end gets pushed where the extractor presses it against the chamber wall, usually. When the firing pin smacks the primer, that further drives the case shoulder hard into and well centered in the chamber shoulder before the firing pin dents the primer enough to crush the pellet against the anvil and finally fires the round. And there's typically a bit of clearance all around the case before and when fired except at its back end that's pressed against the chamber wall. Rounds do not lay in the bottom of the chamber except when they're in it and the bolt's open and not touching the case head whatsoever.</p><p></p><p>Ask your avid shooter where the shoulder of a NO GO headspace gauge goes when the bolt tries to close on it in a GO headspaced chamber, but it won't. Then ask him what's the difference betwen this and what happens to a live round in that same chamber when it's smacked hard by the firing pin. You can probably figure this out all by yourself.</p></blockquote><p></p>
[QUOTE="Bart B, post: 748643, member: 5302"] Your avid shooter doesn't understand how a rimless bottleneck case fits the chamber when it's in there with the bolt closed and especially when its fired. But then, neither to most other shooters understand this. When chambered, if the bolt's got an in line ejector, that pushes the round full forward into the chamber where its shoulder centers in the chamber shoulder. Its back end gets pushed where the extractor presses it against the chamber wall, usually. When the firing pin smacks the primer, that further drives the case shoulder hard into and well centered in the chamber shoulder before the firing pin dents the primer enough to crush the pellet against the anvil and finally fires the round. And there's typically a bit of clearance all around the case before and when fired except at its back end that's pressed against the chamber wall. Rounds do not lay in the bottom of the chamber except when they're in it and the bolt's open and not touching the case head whatsoever. Ask your avid shooter where the shoulder of a NO GO headspace gauge goes when the bolt tries to close on it in a GO headspaced chamber, but it won't. Then ask him what's the difference betwen this and what happens to a live round in that same chamber when it's smacked hard by the firing pin. You can probably figure this out all by yourself. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 RUM load development questions
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