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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Testing two rifles, identical chambers ...different barrels
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<blockquote data-quote="goodgrouper" data-source="post: 111505" data-attributes="member: 2852"><p>From looking at the very dirty rings around your bullet at 400 yards and from the speeds you got, I would venture to say that the powders you are trying might be a tad on the slow side for your guns.</p><p></p><p>I typically do not see as dark of rings around the holes at 100 yard BR matches and your target was 4 times further out and jet black. That tells me the powder is burning dirty and/or inefficiently or it is a hot day or both.</p><p></p><p>COnsider this:</p><p>96 grains of RL25 shoots 300 grain MK's at 3075 from a 36" barrel in a 338 lapua improved over my oehler 35 on a 4' rod. You are dumping in roughly 50 more grains of powder and only getting only 225 fps more with a 3" shorter barrel. That has got to be "sandblasting" your throat with oodles of unburned powder.</p><p></p><p>This might be one of those cartridges that will shoot a slightly faster burning powder at unreal velocities. I would try VV170 or Retumbo and see if it likes them. I'd be willing to bet it shoots faster (although it may or may not shoot as good as you're getting now with H50bmg-those are great groups!) with a slightly faster pressure curve.</p><p></p><p>It might be like the 30-378 wby. The powder everyone seems to use is H50bmg and 180-200 grain bullets and they never go faster than a 300 ultra will using 20 grains less of a faster powder! Then you run RL25 or Retumbo in the 30-378 and they will shoot 180's about 3500 fps and best the ultra by 100 feet or so. The gap gets even wider when heavier bullets are used. </p><p></p><p>ANyhow, looks like a very fun project and it should keep you busy for awhile for sure! Enjoy that monster! /ubbthreads/images/graemlins/cool.gif</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 111505, member: 2852"] From looking at the very dirty rings around your bullet at 400 yards and from the speeds you got, I would venture to say that the powders you are trying might be a tad on the slow side for your guns. I typically do not see as dark of rings around the holes at 100 yard BR matches and your target was 4 times further out and jet black. That tells me the powder is burning dirty and/or inefficiently or it is a hot day or both. COnsider this: 96 grains of RL25 shoots 300 grain MK's at 3075 from a 36" barrel in a 338 lapua improved over my oehler 35 on a 4' rod. You are dumping in roughly 50 more grains of powder and only getting only 225 fps more with a 3" shorter barrel. That has got to be "sandblasting" your throat with oodles of unburned powder. This might be one of those cartridges that will shoot a slightly faster burning powder at unreal velocities. I would try VV170 or Retumbo and see if it likes them. I'd be willing to bet it shoots faster (although it may or may not shoot as good as you're getting now with H50bmg-those are great groups!) with a slightly faster pressure curve. It might be like the 30-378 wby. The powder everyone seems to use is H50bmg and 180-200 grain bullets and they never go faster than a 300 ultra will using 20 grains less of a faster powder! Then you run RL25 or Retumbo in the 30-378 and they will shoot 180's about 3500 fps and best the ultra by 100 feet or so. The gap gets even wider when heavier bullets are used. ANyhow, looks like a very fun project and it should keep you busy for awhile for sure! Enjoy that monster! [img]/ubbthreads/images/graemlins/cool.gif[/img] [/QUOTE]
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Testing two rifles, identical chambers ...different barrels
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