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Rifles, Reloading, Optics, Equipment
Reloading
Bullet jump vs throat erosion
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<blockquote data-quote="Okanogan" data-source="post: 1909680" data-attributes="member: 90397"><p>[USER=93895]@djfergus[/USER] doesn't sound like you are using the GAP reamer so your results may very from mine. I did run my low cost Teslong borescope through the rifle today. I didn't notice anything jump out at me but I'm not a gunsmith either. I ran the bore scope because todays range session was more or less a wash out. RL26 powder charges that gave me less than 1/2 MOA a week ago with 156 EH where over pressuring. (@57.9 gr) The velocities were up bouncing back and forth above 3000 fps which is where I start showing pressure signs with the 156 EH. Also in my 2B contour the groups start opening up above about 2950 fps. I thought maybe a carbon ring or chamber fouling might be the cause as I thought I was past things speeding up. A week ago it took 59+ grain RL 26 to break 3000 fps and 57.8-58.0 put everything in the same hole at about 2940.</p><p> </p><p>I would definitely suggest giving the 156 EH a try, especially if you have RL26 or something similar. I struggled to get them above 2900 with H1000 and my barrel harmonics seem to improve just above that. I would expect yours to be different but who knows. The 156 EH are the best shooting bullet I have tried so for in this rifle, which is probably what I would wish for as I want a hunting rifle for this rig.</p><p></p><p>@Mickecr I get that the original best shooting jump may retain its advantage. That was part of my testing plan today, but it kind of got scraped when velocities and pressures continued to climb. Because I am using the same original bullet and cartridge as a reference point, I think the difference between CBTO and CAOL will have less of an impact on my testing, especially because my original preferred jump was 0.060 which seemed to be a little more forgiving. My plan had been to shoot some of the original preferred COAL along with the newer loads but that will have to wait for the next session with less powder.</p><p></p><p>I'm still courious if others have data that says different bullets' jump change the same as the throat erodes.</p></blockquote><p></p>
[QUOTE="Okanogan, post: 1909680, member: 90397"] [USER=93895]@djfergus[/USER] doesn't sound like you are using the GAP reamer so your results may very from mine. I did run my low cost Teslong borescope through the rifle today. I didn't notice anything jump out at me but I'm not a gunsmith either. I ran the bore scope because todays range session was more or less a wash out. RL26 powder charges that gave me less than 1/2 MOA a week ago with 156 EH where over pressuring. (@57.9 gr) The velocities were up bouncing back and forth above 3000 fps which is where I start showing pressure signs with the 156 EH. Also in my 2B contour the groups start opening up above about 2950 fps. I thought maybe a carbon ring or chamber fouling might be the cause as I thought I was past things speeding up. A week ago it took 59+ grain RL 26 to break 3000 fps and 57.8-58.0 put everything in the same hole at about 2940. I would definitely suggest giving the 156 EH a try, especially if you have RL26 or something similar. I struggled to get them above 2900 with H1000 and my barrel harmonics seem to improve just above that. I would expect yours to be different but who knows. The 156 EH are the best shooting bullet I have tried so for in this rifle, which is probably what I would wish for as I want a hunting rifle for this rig. @Mickecr I get that the original best shooting jump may retain its advantage. That was part of my testing plan today, but it kind of got scraped when velocities and pressures continued to climb. Because I am using the same original bullet and cartridge as a reference point, I think the difference between CBTO and CAOL will have less of an impact on my testing, especially because my original preferred jump was 0.060 which seemed to be a little more forgiving. My plan had been to shoot some of the original preferred COAL along with the newer loads but that will have to wait for the next session with less powder. I'm still courious if others have data that says different bullets' jump change the same as the throat erodes. [/QUOTE]
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Bullet jump vs throat erosion
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