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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: 901489" data-attributes="member: 11717"><p>I also continued load development with the other 2 rifles, 6-284 and 6.5 WSM.</p><p></p><p>Results from the 6.5 WSM... the load was 74 gr of RL33 and 140 VLD's. Last weeks single round velocity was 3346</p><p></p><p>First 5</p><p></p><p>3373</p><p>3373</p><p>3369</p><p>3373</p><p>3376</p><p></p><p>The next 3</p><p></p><p>3387</p><p>3401</p><p>3441</p><p></p><p>As you can see, the first 5 were about as good as it gets for ES, then, pressure and velocity begin to increase.</p><p></p><p>6-284, 64 gr RL33, 105 Hybrids, without typing it all out, they were all over the place from 3503 to 3579... not sure what that's all about but it was an extremely compressed load with powder filling the case literally to the top of the neck. Last weeks 64 gr single round velocity was 3476</p><p></p><p>64 RL33/100 CEB's</p><p></p><p>3573</p><p>3576</p><p>3599</p><p>3589</p><p>3623</p><p></p><p>There seems to be a clear trend of both higher velocities than last weeks workups and increasing velocities and pressures as rounds are fired.</p><p></p><p>I do not think it's the powder because it's happening with Retumbo and RL17 as well.</p><p></p><p>The biggest common denominator is the nitrided barrels. When I got them back, I scrubbed them for a while to remove a dark brownish residue. I never got all of it out, but I read if i got most of it out and fired a couple rounds and cleaned after that it would be good to go. Now I am wondering if this is the problem. I had called H&M last week to find out more about this residue and they said it was a ferrous oxide which is what the black finish was. They did not seem to be too concerned about it and said it contributed to the corrosion resistance of the black nitride treatment.</p><p></p><p>Now, I don't know if that is what is causing my increased pressures, but it's a big maybe. Maybe I need to scrub a little more?</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 901489, member: 11717"] I also continued load development with the other 2 rifles, 6-284 and 6.5 WSM. Results from the 6.5 WSM... the load was 74 gr of RL33 and 140 VLD's. Last weeks single round velocity was 3346 First 5 3373 3373 3369 3373 3376 The next 3 3387 3401 3441 As you can see, the first 5 were about as good as it gets for ES, then, pressure and velocity begin to increase. 6-284, 64 gr RL33, 105 Hybrids, without typing it all out, they were all over the place from 3503 to 3579... not sure what that's all about but it was an extremely compressed load with powder filling the case literally to the top of the neck. Last weeks 64 gr single round velocity was 3476 64 RL33/100 CEB's 3573 3576 3599 3589 3623 There seems to be a clear trend of both higher velocities than last weeks workups and increasing velocities and pressures as rounds are fired. I do not think it's the powder because it's happening with Retumbo and RL17 as well. The biggest common denominator is the nitrided barrels. When I got them back, I scrubbed them for a while to remove a dark brownish residue. I never got all of it out, but I read if i got most of it out and fired a couple rounds and cleaned after that it would be good to go. Now I am wondering if this is the problem. I had called H&M last week to find out more about this residue and they said it was a ferrous oxide which is what the black finish was. They did not seem to be too concerned about it and said it contributed to the corrosion resistance of the black nitride treatment. Now, I don't know if that is what is causing my increased pressures, but it's a big maybe. Maybe I need to scrub a little more? [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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