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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: 901471" data-attributes="member: 11717"><p>OK, so here is the latest... good news and not so good news.</p><p></p><p>Gave the RUM a good BTE cleaning and IOSSO scrubbing and loaded up some rounds. Got to the range with the 3 rifles and started with the 300 RUM. I started with the workup string i did last week, starting with 96 gr and worked up to 102. Data listied below. It went well and after 6 shots, the last being 102 gr, It appeared I was almost back to "normal". there was no pressure signs with 102 charge and velocity was very close, but just a little higher than the first go around last week.</p><p></p><p>Today's velocity readings were generally higher. Temp was colder... 7 vs 23</p><p></p><p>RL33/230 Hybrids</p><p></p><p>....Last Week..Today</p><p>96...2937......2988</p><p>97...2963......3037</p><p>98...2962......3025</p><p>99...3037......3056</p><p>100..3105.....no reading</p><p>101..3121.....3174</p><p>102..3162.....3186 - no pressure sings</p><p>103..3192.....---- slight bolt lift @ 103/3192</p><p></p><p>Then I shot a short RL17/GSC 177 string</p><p></p><p>....Last Week..Today</p><p>88...3424.....-----</p><p>89...3429.....3385 (possibly a bad reading)</p><p>90...3479.....3538 no pressure signs</p><p>91...------......3599 blown primer</p><p></p><p>Hmmmm... form no pressure signs @ 90 to spike in pressure and velocity @ 91</p><p></p><p>Note: I have noticed that RL17 tends to spike very rapidly in large overbore cases. I only used it the the 300 RUM because GSC bullets tend to be lower pressure bore riding type bullets and it was in a nitrided barrel which is also "supposed" to reduce pressure.</p><p></p><p>After the RL117/GSC 177 string, I shot another 102/230 Hybrid load because I was sensing a gradual increasing rate of pressure. Sure enough, velocity was 3217, but there was no apparent sign of excess pressure. </p><p></p><p>Then I ran a Retumbo/180 C21 CEB string</p><p></p><p>....Last Week..Today</p><p>96...-----.......3371</p><p>97...3376.....3415</p><p>98...3401.....3445</p><p>99...3472.....3494 today's showed no pressure signs</p><p>100..3506....3533 last weeks load resulted in a slight blot lift, today's load blew a primer</p><p>101..3530....----- last weeks load blew a primer</p><p></p><p>The trend developing here is higher pressure and velocities with same charge. I decided to shoot one more 102/230 Hybrid load to confirm my suspicion,that the more rounds I sent throught the barrel, the more pressure it was generating. Third round of 102 RL33/230 Hybrid resulted in a velocity of 3550 and a blown primer.</p><p></p><p>Something is going on inside the camber and/or bore.</p><p></p><p>More interesting data form the other 2 rifles in the next post.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 901471, member: 11717"] OK, so here is the latest... good news and not so good news. Gave the RUM a good BTE cleaning and IOSSO scrubbing and loaded up some rounds. Got to the range with the 3 rifles and started with the 300 RUM. I started with the workup string i did last week, starting with 96 gr and worked up to 102. Data listied below. It went well and after 6 shots, the last being 102 gr, It appeared I was almost back to "normal". there was no pressure signs with 102 charge and velocity was very close, but just a little higher than the first go around last week. Today's velocity readings were generally higher. Temp was colder... 7 vs 23 RL33/230 Hybrids ....Last Week..Today 96...2937......2988 97...2963......3037 98...2962......3025 99...3037......3056 100..3105.....no reading 101..3121.....3174 102..3162.....3186 - no pressure sings 103..3192.....---- slight bolt lift @ 103/3192 Then I shot a short RL17/GSC 177 string ....Last Week..Today 88...3424.....----- 89...3429.....3385 (possibly a bad reading) 90...3479.....3538 no pressure signs 91...------......3599 blown primer Hmmmm... form no pressure signs @ 90 to spike in pressure and velocity @ 91 Note: I have noticed that RL17 tends to spike very rapidly in large overbore cases. I only used it the the 300 RUM because GSC bullets tend to be lower pressure bore riding type bullets and it was in a nitrided barrel which is also "supposed" to reduce pressure. After the RL117/GSC 177 string, I shot another 102/230 Hybrid load because I was sensing a gradual increasing rate of pressure. Sure enough, velocity was 3217, but there was no apparent sign of excess pressure. Then I ran a Retumbo/180 C21 CEB string ....Last Week..Today 96...-----.......3371 97...3376.....3415 98...3401.....3445 99...3472.....3494 today's showed no pressure signs 100..3506....3533 last weeks load resulted in a slight blot lift, today's load blew a primer 101..3530....----- last weeks load blew a primer The trend developing here is higher pressure and velocities with same charge. I decided to shoot one more 102/230 Hybrid load to confirm my suspicion,that the more rounds I sent throught the barrel, the more pressure it was generating. Third round of 102 RL33/230 Hybrid resulted in a velocity of 3550 and a blown primer. Something is going on inside the camber and/or bore. More interesting data form the other 2 rifles in the next post. [/QUOTE]
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Need help troubleshooting 300 RUM pressure issue.
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