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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="MontanaRifleman" data-source="post: 906297" data-attributes="member: 11717"><p>I've found in my previous RUM that I got good gains in velocity with increased pressure right up to my max working loads. I don't mind loosing a little speed for something that works and good accuracy. I had guestimated all along that I would max at about 3150-3200, with this combo, and I would settle and be happy with 3100.</p><p></p><p>The unuasual hing about this pressure issue is that it is not constant, so i think that rules out things like a tight muzzle. The gun builder that H&M put me in touch with speculated it might be from a tight bore and that with each firing and laying down of copper and carbon, it might cause increased pressure. But I don't think that's the case with 3 separate barrels in 3 separate cals, although they are all Broughton 5C's. That said, Broughtons are not know to be tight bores like say older Lilja's.</p><p></p><p>I'm speculating that there may be something in the process and/or products I used to clean the bores up after nitiriding.</p><p></p><p></p><p></p><p>Interesting indeed Greg. And quite a relief to see the 6-284 and 6.5 WSM come around... at least so far.</p><p></p><p>I have a 300 RUM and not an EDGE. I started with 56 hulls of new and once fired RP brass. Not the best stuff by far. I am now down to 34 useable cases and 7 of them only partially held the primers in. Had to use super glue to secure them. Would not have resorted to that if I had more brass. My next lot will be Bertram EDGE brass that I will neck down. I'm done with the RP junk.</p><p></p><p></p><p></p><p>Paul, I think Micheal had much different problems than what I'm having. I think he might also be snake bit with the problems he's had with the 300 RUM's. I don't doubt him at all, but my last RUM (Sendero) had about 500-600 hardcore max rounds down it before I sold it and it was still holding close to 1/2 MOA without any tuning. Never shot it with a hot barrel though. And to the best of my knowledge, throat erosion had been minimal as I did not have to chase the lands far. Also know of others who have got about a 1000 rounds give or take out the cartridge. </p><p></p><p>The nitiriding is supposed to increase wear resistance on the throat to slow down erosion, so that's why I had it done. Yeah, i was not surprised that other than some superficial heat checking, the throat and bore were in good condition... other than my lapping it so smooth. </p><p></p><p>So yes, in the smith's opinion, the fire cracking was not deep or advanced and quite normal for that amount of use in a high pressure overbore cartridge. The RUM showed less checking than the 6-284. No wear on the throats, just early stages of alligator skin pattern heat checking. I saw it too.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 906297, member: 11717"] I've found in my previous RUM that I got good gains in velocity with increased pressure right up to my max working loads. I don't mind loosing a little speed for something that works and good accuracy. I had guestimated all along that I would max at about 3150-3200, with this combo, and I would settle and be happy with 3100. The unuasual hing about this pressure issue is that it is not constant, so i think that rules out things like a tight muzzle. The gun builder that H&M put me in touch with speculated it might be from a tight bore and that with each firing and laying down of copper and carbon, it might cause increased pressure. But I don't think that's the case with 3 separate barrels in 3 separate cals, although they are all Broughton 5C's. That said, Broughtons are not know to be tight bores like say older Lilja's. I'm speculating that there may be something in the process and/or products I used to clean the bores up after nitiriding. Interesting indeed Greg. And quite a relief to see the 6-284 and 6.5 WSM come around... at least so far. I have a 300 RUM and not an EDGE. I started with 56 hulls of new and once fired RP brass. Not the best stuff by far. I am now down to 34 useable cases and 7 of them only partially held the primers in. Had to use super glue to secure them. Would not have resorted to that if I had more brass. My next lot will be Bertram EDGE brass that I will neck down. I'm done with the RP junk. Paul, I think Micheal had much different problems than what I'm having. I think he might also be snake bit with the problems he's had with the 300 RUM's. I don't doubt him at all, but my last RUM (Sendero) had about 500-600 hardcore max rounds down it before I sold it and it was still holding close to 1/2 MOA without any tuning. Never shot it with a hot barrel though. And to the best of my knowledge, throat erosion had been minimal as I did not have to chase the lands far. Also know of others who have got about a 1000 rounds give or take out the cartridge. The nitiriding is supposed to increase wear resistance on the throat to slow down erosion, so that's why I had it done. Yeah, i was not surprised that other than some superficial heat checking, the throat and bore were in good condition... other than my lapping it so smooth. So yes, in the smith's opinion, the fire cracking was not deep or advanced and quite normal for that amount of use in a high pressure overbore cartridge. The RUM showed less checking than the 6-284. No wear on the throats, just early stages of alligator skin pattern heat checking. I saw it too. [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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