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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7MM - Need to make a choice
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<blockquote data-quote="MontanaRifleman" data-source="post: 836991" data-attributes="member: 11717"><p>I would say either the 7 WSM, 7-375, 7-300 WM or 7 STW, in that order.</p><p></p><p>The 7 WSM is going to give the best barrel life with the availability of off the shelf dies and brass. Performance will be close to the 7 RM without the scabby belt.</p><p></p><p>The 7-375 will give you upgraded performance but a bit more expense in forming dies. You'll need custom sizing and seating dies as well, but that's the best route to go for any precision rifle project. The case capacity is essentially the same as the STW, but again, no scabby belt.... can you tell I don't like scabby belts? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> You can expect a little more barrel life than the STW because of the sharper shoulder and longer neck. My process for forming the 7-375 case would be...</p><p>Hornady 338 RCM FL</p><p>Hrnady 300 RCM FL</p><p>Custom 7-375 FL Bushing die based on reamer drawing, for final sizing</p><p>Ream and turn to .015 thickness</p><p>Fireform</p><p></p><p>I will not be as irresponsible as some to suggest what you will get 1500 rounds of good accuracy out of any of these cartridges let alone the STW with a .277 long neck and 25* shoulder. I think you can expect about half that with the STW, slightly more with 7-375 and 7-300 WM and a little more with the 7 WSM which should get maybe 1200 give or take depending....</p><p></p><p>The 7-300, will also require some forming and special dies with a little more horsepower than the WSM and less than the others.</p><p></p><p>The STW has off the shelf brass (not a very good selection) and dies. Expect the least barrel life out of the bunch with its 25* shoulder and .277 long neck.</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 836991, member: 11717"] I would say either the 7 WSM, 7-375, 7-300 WM or 7 STW, in that order. The 7 WSM is going to give the best barrel life with the availability of off the shelf dies and brass. Performance will be close to the 7 RM without the scabby belt. The 7-375 will give you upgraded performance but a bit more expense in forming dies. You'll need custom sizing and seating dies as well, but that's the best route to go for any precision rifle project. The case capacity is essentially the same as the STW, but again, no scabby belt.... can you tell I don't like scabby belts? :) You can expect a little more barrel life than the STW because of the sharper shoulder and longer neck. My process for forming the 7-375 case would be... Hornady 338 RCM FL Hrnady 300 RCM FL Custom 7-375 FL Bushing die based on reamer drawing, for final sizing Ream and turn to .015 thickness Fireform I will not be as irresponsible as some to suggest what you will get 1500 rounds of good accuracy out of any of these cartridges let alone the STW with a .277 long neck and 25* shoulder. I think you can expect about half that with the STW, slightly more with 7-375 and 7-300 WM and a little more with the 7 WSM which should get maybe 1200 give or take depending.... The 7-300, will also require some forming and special dies with a little more horsepower than the WSM and less than the others. The STW has off the shelf brass (not a very good selection) and dies. Expect the least barrel life out of the bunch with its 25* shoulder and .277 long neck. [/QUOTE]
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7MM - Need to make a choice
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