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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: 906075" data-attributes="member: 11717"><p>Well... yesterday was an interesting day at the range. Finally some good news.</p><p></p><p>I cleaned all the rifles and headed to the range with various loads. The plan was to shoot Retumbo loads in a clean bore in the 6-284 and 6.5 WSM. Here are the results.</p><p></p><p>6-284, 52 gr of Retumbo, 105 Hybrids, 10 rounds, nice moderate light load.</p><p>3205</p><p>3227</p><p>3213</p><p>3204</p><p>3205</p><p>3219</p><p>3209</p><p>3205</p><p>3207</p><p></p><p>ES, 23, no increasing pressures and velocities.</p><p>Ladder pressure test with Retumbo and the 105's</p><p>53 3225</p><p>54 3287</p><p>55 3322</p><p>56 3373</p><p>57 3445, slightly stiff bolt</p><p></p><p>All went well so I decided to try the 63 gr RL33 loads that pressured out the other day.</p><p>63 gr RL33/105 Hybrids</p><p>3516</p><p>3528</p><p>3566</p><p>3566</p><p>3584 </p><p></p><p>All rounds had a stiff bolt and ejector marks, but i didn't think they were way over pressure. Not a load i would use but not extremely over pressure. There was a climb in prssure and velocity that seemed to plateau.</p><p></p><p>63 gr RL33/100 CEB's</p><p></p><p>3546</p><p>3591</p><p>3579</p><p>3597</p><p>3573</p><p>3604</p><p>3553</p><p></p><p>The middle 5 rounds have an ES of 25. Overall a fairly stable string. Pressure signs were slightly less than the 105 Hybrid string. So still not a load I would use. I plan to load up a couple of strings with 62 gr and shoot for accuracy. will also load up a string with 56 gr of Retumbo.</p><p></p><p>6.5 WSM, 64 gr of Retumbo, 130 CEB's, nice moderate light load.</p><p>3331</p><p>3300</p><p>3304</p><p>3291</p><p>3269</p><p>3287</p><p>3291</p><p>3285</p><p>3285</p><p></p><p>If you throw out the fouling shot and the 5th shot, the 8 round ES is 19.</p><p>Ladder pressure test with Retumbo and the 130's</p><p>65 3255 unusually low</p><p>66 3340 more in line</p><p>67 3455 hmmm</p><p>68 3499 stiff bolt and ejector mark</p><p></p><p></p><p>Will load up an accuracy string with 66.5 gr of Retumbo.</p><p></p><p>Will also load up an accuracy string with 73 gr of RL33 and the 130 CEB's</p><p></p><p>Also decided to try the 98 gr RL33/230 Hybrid load again that pressured out the other day.</p><p></p><p>3227 - I know this velocity is telling me I am on the edge but I decide to fire another round</p><p>3238 - Blown primer</p><p></p><p>I will pull the rest of these and reload to 96 gr and see what happens.</p><p></p><p>It looks like the 6-284 and 6.5 WSM have settled down. The RUM is still generating what I consider to be excessive pressure for the charge loaded. Maybe this rifle will end up liking less powder?</p><p></p><p>Again, the idea was to shoot Retumbo, a less dirty powder than 33, in a clean bore to see if it might stabilize the bore and pressures. It may have done that, or maybe the barrels are just "breaking-in". One way to find out.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 906075, member: 11717"] Well... yesterday was an interesting day at the range. Finally some good news. I cleaned all the rifles and headed to the range with various loads. The plan was to shoot Retumbo loads in a clean bore in the 6-284 and 6.5 WSM. Here are the results. 6-284, 52 gr of Retumbo, 105 Hybrids, 10 rounds, nice moderate light load. 3205 3227 3213 3204 3205 3219 3209 3205 3207 ES, 23, no increasing pressures and velocities. Ladder pressure test with Retumbo and the 105's 53 3225 54 3287 55 3322 56 3373 57 3445, slightly stiff bolt All went well so I decided to try the 63 gr RL33 loads that pressured out the other day. 63 gr RL33/105 Hybrids 3516 3528 3566 3566 3584 All rounds had a stiff bolt and ejector marks, but i didn't think they were way over pressure. Not a load i would use but not extremely over pressure. There was a climb in prssure and velocity that seemed to plateau. 63 gr RL33/100 CEB's 3546 3591 3579 3597 3573 3604 3553 The middle 5 rounds have an ES of 25. Overall a fairly stable string. Pressure signs were slightly less than the 105 Hybrid string. So still not a load I would use. I plan to load up a couple of strings with 62 gr and shoot for accuracy. will also load up a string with 56 gr of Retumbo. 6.5 WSM, 64 gr of Retumbo, 130 CEB's, nice moderate light load. 3331 3300 3304 3291 3269 3287 3291 3285 3285 If you throw out the fouling shot and the 5th shot, the 8 round ES is 19. Ladder pressure test with Retumbo and the 130's 65 3255 unusually low 66 3340 more in line 67 3455 hmmm 68 3499 stiff bolt and ejector mark Will load up an accuracy string with 66.5 gr of Retumbo. Will also load up an accuracy string with 73 gr of RL33 and the 130 CEB's Also decided to try the 98 gr RL33/230 Hybrid load again that pressured out the other day. 3227 - I know this velocity is telling me I am on the edge but I decide to fire another round 3238 - Blown primer I will pull the rest of these and reload to 96 gr and see what happens. It looks like the 6-284 and 6.5 WSM have settled down. The RUM is still generating what I consider to be excessive pressure for the charge loaded. Maybe this rifle will end up liking less powder? Again, the idea was to shoot Retumbo, a less dirty powder than 33, in a clean bore to see if it might stabilize the bore and pressures. It may have done that, or maybe the barrels are just "breaking-in". One way to find out. [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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