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Rifles, Reloading, Optics, Equipment
Reloading
Need technical input: rifle project based on 7LRM cartridge necked to .277
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<blockquote data-quote="codyadams" data-source="post: 2023813" data-attributes="member: 87243"><p>You make a good point with the .270 WSM, that is a factory cartridge with dies easily available. I have loaded for one, 145 ELD-X's just over 3200 fps from a 24", and that is with the stubby SAAMI throat. You throat that WSM how it should be for the 170's, and it will break 3000 with them. It will have to run in a medium/long action for a repeater as OAL will probably be 3.2" or so, but nothing wrong with that. </p><p></p><p>I don't think a 6.5 prc would do it, as far as performance it is nearly identical to a 6.5x284. However, a 300 PRC necked down would be another option. I know Rich has a 30 and 28 Sherman Magnum, they are insane. The 300 is sending 245's at 3000 fps out of a 28", the 28 is getting 195's over 3200, it is insane. A 170 would be flat out moving! That is a 300 prc with the taper blown out and a 40° shoulder though, simply necked down would still be good, not sure about a .270 bushing is a 300 prc die, you would need to make sure there was plenty of taper in the bushing. All good options, but I think his original idea would be fine too. </p><p></p><p>Have the rifle made. Get a hornady bushing die for 7 LRM, and get a bushing for .270. Get some ADG brass. That is all you have to do!!</p></blockquote><p></p>
[QUOTE="codyadams, post: 2023813, member: 87243"] You make a good point with the .270 WSM, that is a factory cartridge with dies easily available. I have loaded for one, 145 ELD-X's just over 3200 fps from a 24", and that is with the stubby SAAMI throat. You throat that WSM how it should be for the 170's, and it will break 3000 with them. It will have to run in a medium/long action for a repeater as OAL will probably be 3.2" or so, but nothing wrong with that. I don't think a 6.5 prc would do it, as far as performance it is nearly identical to a 6.5x284. However, a 300 PRC necked down would be another option. I know Rich has a 30 and 28 Sherman Magnum, they are insane. The 300 is sending 245's at 3000 fps out of a 28", the 28 is getting 195's over 3200, it is insane. A 170 would be flat out moving! That is a 300 prc with the taper blown out and a 40° shoulder though, simply necked down would still be good, not sure about a .270 bushing is a 300 prc die, you would need to make sure there was plenty of taper in the bushing. All good options, but I think his original idea would be fine too. Have the rifle made. Get a hornady bushing die for 7 LRM, and get a bushing for .270. Get some ADG brass. That is all you have to do!! [/QUOTE]
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Need technical input: rifle project based on 7LRM cartridge necked to .277
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