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<blockquote data-quote="NZ Longranger" data-source="post: 125384" data-attributes="member: 14"><p>Brian,</p><p>it depends how you are judging burning rate. If you are comparing velocity achieved versus powder weight then H50BMG appears slower as it takes slightly more powder to equal H870's velocity, but pressure will be slightly higher as well. I measure pressure with a strain gauge setup on an Oehler 43. When you compare charge weight versus pressure, H50BMG is slightly faster than H870. Different lots of H870 can vary quite a bit though, I always chronograph and pressure test when I open a new tin.</p><p></p><p>Steve,</p><p>with an 11 pound all up rifle weight, you can pretty much choose any calibre you wish and recoil won't be a problem if you brake it. If you want to stick with a factory calibre, I would choose the 7mm RUM, especially as Nosler are now making quality 300 RUM brass you can neck down. If you want the hottest 7mm wildcat, Kirby's 7mmAM or another version based on the 338 Lapua case would be it. A 26 to 30" number six or seven contour barrel from one of the top barrel makers would be my choice, depending on your portability requirements. A one in nine twist will stabilise any of the good long-range bullets, but I haven't had much success stabilising the 200 grain Wildcat ULD's in a 9 inch twist to 1000 yards, although others have. I have a one in 8 twist barrel coming to try these ULD's beyond 1000 yards where they should come in to their own. Either a trued Remington action or one of the custom actions if you can afford it. A varmint style stock with a round, slightly wider forend from Macmillan, HS precision, Lone Wolf or one of the other top stock makers. The Leupold Mk4 4.5-14x50 you already have will work fine out to 1000 yards.</p><p>These are just my suggestions, but the big 7mm's have the best compromise of ballistics, manageable recoil and killing power for rifles about the 10 pound mark.</p><p>Greg</p></blockquote><p></p>
[QUOTE="NZ Longranger, post: 125384, member: 14"] Brian, it depends how you are judging burning rate. If you are comparing velocity achieved versus powder weight then H50BMG appears slower as it takes slightly more powder to equal H870's velocity, but pressure will be slightly higher as well. I measure pressure with a strain gauge setup on an Oehler 43. When you compare charge weight versus pressure, H50BMG is slightly faster than H870. Different lots of H870 can vary quite a bit though, I always chronograph and pressure test when I open a new tin. Steve, with an 11 pound all up rifle weight, you can pretty much choose any calibre you wish and recoil won't be a problem if you brake it. If you want to stick with a factory calibre, I would choose the 7mm RUM, especially as Nosler are now making quality 300 RUM brass you can neck down. If you want the hottest 7mm wildcat, Kirby's 7mmAM or another version based on the 338 Lapua case would be it. A 26 to 30" number six or seven contour barrel from one of the top barrel makers would be my choice, depending on your portability requirements. A one in nine twist will stabilise any of the good long-range bullets, but I haven't had much success stabilising the 200 grain Wildcat ULD's in a 9 inch twist to 1000 yards, although others have. I have a one in 8 twist barrel coming to try these ULD's beyond 1000 yards where they should come in to their own. Either a trued Remington action or one of the custom actions if you can afford it. A varmint style stock with a round, slightly wider forend from Macmillan, HS precision, Lone Wolf or one of the other top stock makers. The Leupold Mk4 4.5-14x50 you already have will work fine out to 1000 yards. These are just my suggestions, but the big 7mm's have the best compromise of ballistics, manageable recoil and killing power for rifles about the 10 pound mark. Greg [/QUOTE]
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