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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: 907169" data-attributes="member: 11717"><p>My analysis to date.</p><p></p><p>The 6-284 and 6.5 WSM seem to sorta "get over" whatever pressure issues they had. That said, the max loads in volume of powder are slightly lower, by maybe a couple of grains, than the original work up pressure/velocity testing, but are showing the same pressures and velocity. So no loss in velocity performance. The lower charge weights are good as they the max loads are no longer so compressed as they originally were.</p><p></p><p>In the RUM, I am seeing about equal pressure/velocity with 96 gr of RL33 as I did with 100 gr of RL33 in the original pressure/velocity testing. So something has happened in the bore to cause this and I just don't know what it is. My smith thinks i have removed about 2-3 tenths of a thou of steel from the bore with my lapping. If so, the nitride should be completely gone and would not be a factor.</p><p></p><p>Here are the 3 pressure work up strings I shot on separate days.</p><p></p><p>96.... 2937...........2988..........3017</p><p>97.... 2963...........3037..........3043</p><p>98.... 2962...........3075..........3097</p><p>99.... 3037...........-----.........3138</p><p>100.. 3105...........-----..........3182</p><p>101.. 3121...........3174.........3203 blown Primer</p><p>102.. 3162...........3186/3217 heavy bolt on 3217</p><p>103.. 3192 slightly sticky bolt</p><p></p><p>Yesterday's 96 gr velocities averaged about 3100 and are close to max. 98 grains is over max as already demonstrated with a blown primer. I will try 97 gr next and see what happens there for curiosity.</p><p></p><p>Bottom line, somewhere in the time I got these barrels back from nitriding to now, something happened inside them to change their dynamics.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 907169, member: 11717"] My analysis to date. The 6-284 and 6.5 WSM seem to sorta "get over" whatever pressure issues they had. That said, the max loads in volume of powder are slightly lower, by maybe a couple of grains, than the original work up pressure/velocity testing, but are showing the same pressures and velocity. So no loss in velocity performance. The lower charge weights are good as they the max loads are no longer so compressed as they originally were. In the RUM, I am seeing about equal pressure/velocity with 96 gr of RL33 as I did with 100 gr of RL33 in the original pressure/velocity testing. So something has happened in the bore to cause this and I just don't know what it is. My smith thinks i have removed about 2-3 tenths of a thou of steel from the bore with my lapping. If so, the nitride should be completely gone and would not be a factor. Here are the 3 pressure work up strings I shot on separate days. 96.... 2937...........2988..........3017 97.... 2963...........3037..........3043 98.... 2962...........3075..........3097 99.... 3037...........-----.........3138 100.. 3105...........-----..........3182 101.. 3121...........3174.........3203 blown Primer 102.. 3162...........3186/3217 heavy bolt on 3217 103.. 3192 slightly sticky bolt Yesterday's 96 gr velocities averaged about 3100 and are close to max. 98 grains is over max as already demonstrated with a blown primer. I will try 97 gr next and see what happens there for curiosity. Bottom line, somewhere in the time I got these barrels back from nitriding to now, something happened inside them to change their dynamics. [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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