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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger .338 300 grain EH - ballistic coefficient
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<blockquote data-quote="D.Camilleri" data-source="post: 1172682" data-attributes="member: 2567"><p>Timber,</p><p></p><p>The last time I went out to shoot, the temps were in the mid 20's, my go to load of H-1000 and the 300 gr Berger OTM, first shot was slightly faster than average and then each shot after dropped about 20 fps for several shots. Rifle and ammo was cold. My thought is that the bore is expanding as the barrel temp comes up and lowers pressure slightly.</p><p></p><p>All of the reading on rl33 seems to show that it likes high pressure for consistency. In a thread started by Kirby, he had lots of velocity spread when the bullets were away from the lands. I don't load to the lands, so I need to test and see, but this is why I am trying to get a high pressure load to see if it helps. I am not sure that I can get enough rl33 into my case to see a benefit with the berger, but with the accubond longer bearing surface, it seems to help with the pressure. I should be able to find out in a couple of days.</p><p></p><p>I also bought some of the new imr 7977 powder that is supposed to have a burn rate similar to retumbo, no temp sensitivity and lower pressure higher velocity than retumbo or h-1000.</p><p></p><p>The last time I shot I wasn't getting my normal good groups and I decided to bed my recoil lug on my bell and carlson alaskan stock and see if the groups shrink again. So I won't really know what helped the most, but hopefully it shoots good again.</p></blockquote><p></p>
[QUOTE="D.Camilleri, post: 1172682, member: 2567"] Timber, The last time I went out to shoot, the temps were in the mid 20's, my go to load of H-1000 and the 300 gr Berger OTM, first shot was slightly faster than average and then each shot after dropped about 20 fps for several shots. Rifle and ammo was cold. My thought is that the bore is expanding as the barrel temp comes up and lowers pressure slightly. All of the reading on rl33 seems to show that it likes high pressure for consistency. In a thread started by Kirby, he had lots of velocity spread when the bullets were away from the lands. I don't load to the lands, so I need to test and see, but this is why I am trying to get a high pressure load to see if it helps. I am not sure that I can get enough rl33 into my case to see a benefit with the berger, but with the accubond longer bearing surface, it seems to help with the pressure. I should be able to find out in a couple of days. I also bought some of the new imr 7977 powder that is supposed to have a burn rate similar to retumbo, no temp sensitivity and lower pressure higher velocity than retumbo or h-1000. The last time I shot I wasn't getting my normal good groups and I decided to bed my recoil lug on my bell and carlson alaskan stock and see if the groups shrink again. So I won't really know what helped the most, but hopefully it shoots good again. [/QUOTE]
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Berger .338 300 grain EH - ballistic coefficient
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