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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New 270 boondoggle wildcat testing
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<blockquote data-quote="yorke-1" data-source="post: 1595650" data-attributes="member: 11960"><p>I used US869 in the 270 RUM and it worked alright, but it's so temp sensitive that I'd get 100 fps swings between summer and winter. In the 6.5 Badger (6.5x338 RUM IMP) I have the same concerns about powder bridging so I stick with US869 in that as well. I tried H50bmg in the 6.5 but stopped very early on because of some erratic pressure spikes that I attributed to bridging issues. It probably wouldn't be as much of an issue with the 270 because of the larger bore but I'd still test it out slowly. That's why I kept the 35° shoulder on this project; otherwise I would have gone with a more aggressive case. Besides, this case already holds 110gr H20 which is more than enough in a 270. I haven't checked yet, but that probably gives a usable case capacity of about 100gr with a bullet seated to 3.600". Right now it looks like Retumbo and simlar powders are just about perfect for the 140-150gr range, so I'm fine with that.</p><p></p><p></p><p></p><p>That's a good looking reamer! I think I have a Model 70 in 7 WSM tucked away somewhere that would make a great donor action for one of those.</p></blockquote><p></p>
[QUOTE="yorke-1, post: 1595650, member: 11960"] I used US869 in the 270 RUM and it worked alright, but it's so temp sensitive that I'd get 100 fps swings between summer and winter. In the 6.5 Badger (6.5x338 RUM IMP) I have the same concerns about powder bridging so I stick with US869 in that as well. I tried H50bmg in the 6.5 but stopped very early on because of some erratic pressure spikes that I attributed to bridging issues. It probably wouldn't be as much of an issue with the 270 because of the larger bore but I'd still test it out slowly. That's why I kept the 35° shoulder on this project; otherwise I would have gone with a more aggressive case. Besides, this case already holds 110gr H20 which is more than enough in a 270. I haven't checked yet, but that probably gives a usable case capacity of about 100gr with a bullet seated to 3.600". Right now it looks like Retumbo and simlar powders are just about perfect for the 140-150gr range, so I'm fine with that. That's a good looking reamer! I think I have a Model 70 in 7 WSM tucked away somewhere that would make a great donor action for one of those. [/QUOTE]
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New 270 boondoggle wildcat testing
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