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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="Timber338" data-source="post: 1172548" data-attributes="member: 33822"><p>I do still have my go-to 300 Accubond load that I ran through the paces. With RL33 I was able to get up to about the 2875 where I saw pressure signs. But I found the supreme accuracy I am getting now in the 2730 fps range with the accubond. Just the character of my barrel. I think I was shooting in the 3/4 MOA range around 2800, but the bullets started overlapping each other where I am at now.</p><p></p><p>When I moved to the 300 Berger, I actually did not change anything ... just loaded the new bullet and off I went to the range. My chrono said I was getting 2725 which may prove to be 20 fps too high. We'll see what happens when I get out to shoot again.</p><p></p><p>And you've got me convinced to load up 3 rounds with maybe an additional 2 grains and see how it groups at 1000. You are right the Berger has a shorter bearing surface so I could likely get some more FPS out of it. We'll see how that goes too.</p><p></p><p>And the reason I switched from the Accubond to the Berger, was that I was seeing some inconsistent velocities at least shooting over my Magnetospeed. First cold bore shot was usually at least 40 fps higher than all the rest and sometimes as high as 60 fps higher.... which I think was a unique situation with the burn characteristics of RL33. This may be bull$#!t, but my theory is that the cold bore shot pressured the RL33 more and created higher velocity. Which sort of is consistent with other people testing of the RL33 that shows it really burns well with higher pressures. With H1000 and the Berger, I saw that each consecutive shot was increasing in FPS. Not by much, but still a trend that I would see over and over. </p><p></p><p>With the Berger's shorter bearing surface I did notice my velocity to become more consistent ... i still see the first shot being higher than the next two or three shots, but it's got a much smaller extreme spread.</p><p></p><p>So my mind is saying split the difference in burn rate and maybe Retumbo would be dead nuts consistent for muzzle velocity ???? An expensive experiment if I'm only getting about 4 inches of vertical spread at 1000 yards with RL33.</p><p></p><p>And just because you commented on the "who shoots a 338 RUM" thread about switching to the Accubond, I'm still going to hunt with the accubond loaded in my magazine for short forest shots. If I am set up for a long shot I will just single load the 300 EH since it won't fit in my magazine box anyways. Both of those bullets shot to the same vertical point of impact in my rifle, I only had to move my windage 2 clicks when I switched to the Berger.</p><p></p><p>And I have not done anything special to verify my Kestrel pressure readings ... not really sure how I would go about doing that anyways. I do always cross reference with my Leica 1600b, and they always seem to bet within 0.02-0.04 inHg which I don't think makes much of a difference.</p></blockquote><p></p>
[QUOTE="Timber338, post: 1172548, member: 33822"] I do still have my go-to 300 Accubond load that I ran through the paces. With RL33 I was able to get up to about the 2875 where I saw pressure signs. But I found the supreme accuracy I am getting now in the 2730 fps range with the accubond. Just the character of my barrel. I think I was shooting in the 3/4 MOA range around 2800, but the bullets started overlapping each other where I am at now. When I moved to the 300 Berger, I actually did not change anything ... just loaded the new bullet and off I went to the range. My chrono said I was getting 2725 which may prove to be 20 fps too high. We'll see what happens when I get out to shoot again. And you've got me convinced to load up 3 rounds with maybe an additional 2 grains and see how it groups at 1000. You are right the Berger has a shorter bearing surface so I could likely get some more FPS out of it. We'll see how that goes too. And the reason I switched from the Accubond to the Berger, was that I was seeing some inconsistent velocities at least shooting over my Magnetospeed. First cold bore shot was usually at least 40 fps higher than all the rest and sometimes as high as 60 fps higher.... which I think was a unique situation with the burn characteristics of RL33. This may be bull$#!t, but my theory is that the cold bore shot pressured the RL33 more and created higher velocity. Which sort of is consistent with other people testing of the RL33 that shows it really burns well with higher pressures. With H1000 and the Berger, I saw that each consecutive shot was increasing in FPS. Not by much, but still a trend that I would see over and over. With the Berger's shorter bearing surface I did notice my velocity to become more consistent ... i still see the first shot being higher than the next two or three shots, but it's got a much smaller extreme spread. So my mind is saying split the difference in burn rate and maybe Retumbo would be dead nuts consistent for muzzle velocity ???? An expensive experiment if I'm only getting about 4 inches of vertical spread at 1000 yards with RL33. And just because you commented on the "who shoots a 338 RUM" thread about switching to the Accubond, I'm still going to hunt with the accubond loaded in my magazine for short forest shots. If I am set up for a long shot I will just single load the 300 EH since it won't fit in my magazine box anyways. Both of those bullets shot to the same vertical point of impact in my rifle, I only had to move my windage 2 clicks when I switched to the Berger. And I have not done anything special to verify my Kestrel pressure readings ... not really sure how I would go about doing that anyways. I do always cross reference with my Leica 1600b, and they always seem to bet within 0.02-0.04 inHg which I don't think makes much of a difference. [/QUOTE]
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Berger .338 300 grain EH - ballistic coefficient
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