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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Badlands Precision Bullets thread - From BC to terminal ballistics
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<blockquote data-quote="cbuck516" data-source="post: 2677732" data-attributes="member: 122236"><p>I am looking to build a 270 WSM with a 20" barrel as I will hunt with it suppressed. My 300 PRC does that no problem, but the recoil is not trivial. I also really love the nostalgia of the 277 bullet as my family has been shooting 270's since at least as far back as 1954. Using my personal N570 powder profile, the 270 WSM looks to be capable of producing around 3,100fps in the 140gr and around 3,020fps for the 150 gr. If someone were willing to go with a 26" barrel those velocities would increase to 3,350fps for the 140gr and 3,260fps for the 150gr. </p><p>Not having either the 140gr or 150gr in my hands, I had to make some assumptions about the dimensions of the boat tail, but set up both loads to be seated 0.020" above the neck/shoulder junction in the case. That being said, these 270 WSM are at a COAL of 3.12" and 3.20" for the 140gr and 150gr, respectively. For that reason this will definitely be going in a long action.</p><p></p><p>With that 20" barrel the recoil is calculated to be 20ft#-21ft# for the 140gr and 150gr. That is a big recoil reduction from my current 300 PRC load which is at 34ft# of recoil. </p><p></p><p>I will be picking up some other powders at the local gun show next weekend and hope to profile N565, N560, N555, and N550. I would also like to profile Retumbo and Magnum.</p></blockquote><p></p>
[QUOTE="cbuck516, post: 2677732, member: 122236"] I am looking to build a 270 WSM with a 20" barrel as I will hunt with it suppressed. My 300 PRC does that no problem, but the recoil is not trivial. I also really love the nostalgia of the 277 bullet as my family has been shooting 270's since at least as far back as 1954. Using my personal N570 powder profile, the 270 WSM looks to be capable of producing around 3,100fps in the 140gr and around 3,020fps for the 150 gr. If someone were willing to go with a 26" barrel those velocities would increase to 3,350fps for the 140gr and 3,260fps for the 150gr. Not having either the 140gr or 150gr in my hands, I had to make some assumptions about the dimensions of the boat tail, but set up both loads to be seated 0.020" above the neck/shoulder junction in the case. That being said, these 270 WSM are at a COAL of 3.12" and 3.20" for the 140gr and 150gr, respectively. For that reason this will definitely be going in a long action. With that 20" barrel the recoil is calculated to be 20ft#-21ft# for the 140gr and 150gr. That is a big recoil reduction from my current 300 PRC load which is at 34ft# of recoil. I will be picking up some other powders at the local gun show next weekend and hope to profile N565, N560, N555, and N550. I would also like to profile Retumbo and Magnum. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Badlands Precision Bullets thread - From BC to terminal ballistics
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