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<blockquote data-quote="specweldtom" data-source="post: 422861" data-attributes="member: 2580"><p>Winmag, I may be able to help a little bit. I'm not familiar with the Mod 70 action, either pre '64 or post '64 push feed, but I'll share what I do know.</p><p></p><p>First, if it's a post '64, be sure the serial # has a G prefix. The ones without the G prefix I believe are investment castings. They made them during the transition. If it's a pre '64, they're all forged.</p><p>I wouldn't barrel up a RUM on a cast receiver. Just my opinion.</p><p></p><p>On the bolt face, the only thing I recommend is if the Winchester bolt has a recessed face like the Rem or Wby, turn a slight chamfer on the inside front corner of the lip to be sure you headspace on the base of the cartridge and not the bevel on the cartridge just in front of the extraction groove. I saw that happen on a Rem 700 bolt. </p><p> </p><p>#1 question. If you are willing to single load, no problem. The cartridge OAL's you listed are probably maximum SAAMI OAL's and could be loaded short enough to fit in a .300 Wby length magazine, particularly with 200-225gr bullets.</p><p></p><p>#2 question. Given the same barrel length, the .338 RUM can't quite match the Edge performance, but it is so good that I could live with it easily. </p><p></p><p>#3 question. You may not need new bottom metal, but you will need a mag box and follower that will feed the fat RUM case. The .300 Wby is a staggered feed, and may not be able to be modified to feed the RUM cartridge. The right pieces are available for Rem 700's and Wby MK V's, but I don't know about the Mod 70. </p><p></p><p>The .338 Win Mag bolt face is a std belted mag bolt face and the .300 WSM has a .473 case head. It's not on JE's list. You would have to change bolts. Instead, look at the Rem .300 Short Action Ultra Mag (SAUM). It should work, and might feed out of the .338 Win magazine. I haven't done it, so I don't know.</p><p></p><p>#4 question. I will always spend money on a custom barrel instead of expecting a factory barrel to perform satisfactorily. My experience is that factory barrels only meet 1 moa about 25-30% of the time. A quality custom barrel such as a Lilja, Krieger, Hart, etc. will do it every time if the installation is done right. Also just my opinion. </p><p></p><p>Except for solving feeding problems, I think you can rebarrel your rifles to do what you want. If you know a 'smith who is building consistently accurate rifles, talk to him about your projects. There's an excellent chance that an experienced professional riflesmith can answer your questions definitively. </p><p></p><p>I hope that some more knowledgable members will jump in.</p><p></p><p>Good luck, Tom</p></blockquote><p></p>
[QUOTE="specweldtom, post: 422861, member: 2580"] Winmag, I may be able to help a little bit. I'm not familiar with the Mod 70 action, either pre '64 or post '64 push feed, but I'll share what I do know. First, if it's a post '64, be sure the serial # has a G prefix. The ones without the G prefix I believe are investment castings. They made them during the transition. If it's a pre '64, they're all forged. I wouldn't barrel up a RUM on a cast receiver. Just my opinion. On the bolt face, the only thing I recommend is if the Winchester bolt has a recessed face like the Rem or Wby, turn a slight chamfer on the inside front corner of the lip to be sure you headspace on the base of the cartridge and not the bevel on the cartridge just in front of the extraction groove. I saw that happen on a Rem 700 bolt. #1 question. If you are willing to single load, no problem. The cartridge OAL's you listed are probably maximum SAAMI OAL's and could be loaded short enough to fit in a .300 Wby length magazine, particularly with 200-225gr bullets. #2 question. Given the same barrel length, the .338 RUM can't quite match the Edge performance, but it is so good that I could live with it easily. #3 question. You may not need new bottom metal, but you will need a mag box and follower that will feed the fat RUM case. The .300 Wby is a staggered feed, and may not be able to be modified to feed the RUM cartridge. The right pieces are available for Rem 700's and Wby MK V's, but I don't know about the Mod 70. The .338 Win Mag bolt face is a std belted mag bolt face and the .300 WSM has a .473 case head. It's not on JE's list. You would have to change bolts. Instead, look at the Rem .300 Short Action Ultra Mag (SAUM). It should work, and might feed out of the .338 Win magazine. I haven't done it, so I don't know. #4 question. I will always spend money on a custom barrel instead of expecting a factory barrel to perform satisfactorily. My experience is that factory barrels only meet 1 moa about 25-30% of the time. A quality custom barrel such as a Lilja, Krieger, Hart, etc. will do it every time if the installation is done right. Also just my opinion. Except for solving feeding problems, I think you can rebarrel your rifles to do what you want. If you know a 'smith who is building consistently accurate rifles, talk to him about your projects. There's an excellent chance that an experienced professional riflesmith can answer your questions definitively. I hope that some more knowledgable members will jump in. Good luck, Tom [/QUOTE]
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