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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: 2023731" data-attributes="member: 87243"><p>Your best bet is going to be what BIGNGREEN said. Just get a 7 LRM bushing die, and get the proper bushing for the .277, there is only .007" different the diameter of the 7 and your .277 LRM, this will not be an issue, and you will barely feel it pass through the bushing die. Then, get some of the ADG 7 LRM brass, and sell the hornady stuff. Lube, size, prime, dump powder, seat a bullet. </p><p></p><p>With a 26" barrel, I would bet you will see around 3000 fps or better with a 170 EOL. If you haven't already got a barrel/action, you may also want to look at the .270 Sherman, based off a standard .270 win., 40° shoulder and less taper, and with a 26" will also do around 3000+ fps. The only reason I suggest it is because you use .270 brass, which you will always be able to find, and also has tough precision American made brass available through Peterson. Absolutely nothing wrong with your idea, and it would be a cool cartridge, but if being able to readily find brass is a concern, or if you already have a long action standard bolt face action or something, this may also be a suitable option to propell a heavy .277 bullet. Whatever chamber you do, just make sure you get an 8 twist barrel if you want to shoot the best bc bullets! I know the .270 Sherman we put together is a Hammer, I didn't use to be a fan of the .277 cal until these new high bc heavy bullets came out, now it is a fantastic middle ground caliber!!</p></blockquote><p></p>
[QUOTE="codyadams, post: 2023731, member: 87243"] Your best bet is going to be what BIGNGREEN said. Just get a 7 LRM bushing die, and get the proper bushing for the .277, there is only .007" different the diameter of the 7 and your .277 LRM, this will not be an issue, and you will barely feel it pass through the bushing die. Then, get some of the ADG 7 LRM brass, and sell the hornady stuff. Lube, size, prime, dump powder, seat a bullet. With a 26" barrel, I would bet you will see around 3000 fps or better with a 170 EOL. If you haven't already got a barrel/action, you may also want to look at the .270 Sherman, based off a standard .270 win., 40° shoulder and less taper, and with a 26" will also do around 3000+ fps. The only reason I suggest it is because you use .270 brass, which you will always be able to find, and also has tough precision American made brass available through Peterson. Absolutely nothing wrong with your idea, and it would be a cool cartridge, but if being able to readily find brass is a concern, or if you already have a long action standard bolt face action or something, this may also be a suitable option to propell a heavy .277 bullet. Whatever chamber you do, just make sure you get an 8 twist barrel if you want to shoot the best bc bullets! I know the .270 Sherman we put together is a Hammer, I didn't use to be a fan of the .277 cal until these new high bc heavy bullets came out, now it is a fantastic middle ground caliber!! [/QUOTE]
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Need technical input: rifle project based on 7LRM cartridge necked to .277
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