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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help troubleshooting 300 RUM pressure issue.
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<blockquote data-quote="Pdvdh" data-source="post: 906533" data-attributes="member: 4191"><p>Your 300 RUM is being a real fuss-bucket. Seems like you've covered all of the more common possible causes. You're getting such an extreme increase in pressure with repetitive firings that the causes I've experienced in the past wouldn't even account for it. </p><p></p><p>Since the pressure is quite consistently increasing with each additional round fired after starting with a clean bore, I can't help but conclude that <strong>something</strong> is layering onto the bore with each additional shot fired that's restricting the bore or increasing bullet/bore friction and creating elevated pressures. But I've not experienced anything like this before, let alone heard of anything of the kind. So while this rationale seems the most likely cause, I have no explanation or recommendation.</p><p></p><p>Nitriding should reduce bore/bullet friction rather than be any cause of increased friction. You've already put quite a few rounds down the bore for me to think it's got anything to do with residue from the nitride bath. Hope you're able to determine the cause. Or if not, that the pressure variations diminish so you can get on with load development and start enjoying your rifle.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 906533, member: 4191"] Your 300 RUM is being a real fuss-bucket. Seems like you've covered all of the more common possible causes. You're getting such an extreme increase in pressure with repetitive firings that the causes I've experienced in the past wouldn't even account for it. Since the pressure is quite consistently increasing with each additional round fired after starting with a clean bore, I can't help but conclude that [B]something[/B] is layering onto the bore with each additional shot fired that's restricting the bore or increasing bullet/bore friction and creating elevated pressures. But I've not experienced anything like this before, let alone heard of anything of the kind. So while this rationale seems the most likely cause, I have no explanation or recommendation. Nitriding should reduce bore/bullet friction rather than be any cause of increased friction. You've already put quite a few rounds down the bore for me to think it's got anything to do with residue from the nitride bath. Hope you're able to determine the cause. Or if not, that the pressure variations diminish so you can get on with load development and start enjoying your rifle. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Need help troubleshooting 300 RUM pressure issue.
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