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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: 901066" data-attributes="member: 11717"><p>Thanks for input Dan, When the 102 gr load over pressured on me I thought maybe it was the temp diff. But when the it continued to over pressure all the way down to 87 gr, I figured something is going on with the rifle. After I cleaned it the first time and got low velocity with no pressure signs at 99 gr and then spiked up 106 fps when increasing to 100 with more big pressure signs and then backing down to 99 and still seeing pressure with a velocity 91 fps greater than the 99 gr load I had shot just 2 shots previous, I figure there is something going on in the chamber or bore. Who knows.</p><p></p><p>Something to note is I used the same powder from the same jug to shoot the other two rifles. Both of them have 35* shoulders and the RUM a 30* shoulder. I also shot the max loads from last weeks workup at lower temps also. The load in the 6.5 WSM was 74 gr (very compressed) and i did try a round at 74.5 prior to loading and shooting the 74 gr loads. It showed slight pressure, so I backed back down to 74. Velocities shooting 140 VLD's were,</p><p></p><p> 3441</p><p> 3431</p><p> 3453</p><p> 3457</p><p></p><p>for an extreme spread of 26</p><p></p><p>The 6-284 velocities shooting 105 Hybrids were,</p><p></p><p> 3513</p><p> 3538</p><p> 3521</p><p> 3536</p><p> </p><p>for an extreme spread of 25</p><p></p><p>High velocities and max pressures with no hiccups.</p><p></p><p>33 is somewhat temp sensitive, but I don't think that is the problem in the RUM</p><p></p><p>I also loaded Retumbo and 180 bullets (E-Tips and CEB's) in my previous 300 RUM Sendero. My max was 98 gr.</p><p></p><p>Thanks again for the input</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 901066, member: 11717"] Thanks for input Dan, When the 102 gr load over pressured on me I thought maybe it was the temp diff. But when the it continued to over pressure all the way down to 87 gr, I figured something is going on with the rifle. After I cleaned it the first time and got low velocity with no pressure signs at 99 gr and then spiked up 106 fps when increasing to 100 with more big pressure signs and then backing down to 99 and still seeing pressure with a velocity 91 fps greater than the 99 gr load I had shot just 2 shots previous, I figure there is something going on in the chamber or bore. Who knows. Something to note is I used the same powder from the same jug to shoot the other two rifles. Both of them have 35* shoulders and the RUM a 30* shoulder. I also shot the max loads from last weeks workup at lower temps also. The load in the 6.5 WSM was 74 gr (very compressed) and i did try a round at 74.5 prior to loading and shooting the 74 gr loads. It showed slight pressure, so I backed back down to 74. Velocities shooting 140 VLD's were, 3441 3431 3453 3457 for an extreme spread of 26 The 6-284 velocities shooting 105 Hybrids were, 3513 3538 3521 3536 for an extreme spread of 25 High velocities and max pressures with no hiccups. 33 is somewhat temp sensitive, but I don't think that is the problem in the RUM I also loaded Retumbo and 180 bullets (E-Tips and CEB's) in my previous 300 RUM Sendero. My max was 98 gr. Thanks again for the input [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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