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Rifles, Reloading, Optics, Equipment
Gunsmithing
Rem 700 RUM action safe for Lapua/Norma
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<blockquote data-quote="MagnumManiac" data-source="post: 2316550" data-attributes="member: 10755"><p>2 things come to mind doing this conversion.</p><p>1) removing metal from behind the bottom lug abutment to lengthen the magazine should be avoided.</p><p>2) the bolt face requires bushing, the plunger ejector hole filling and a M16 or Sako style extractor fitted.</p><p>So, after removing the factory extractor, the bolt gets a 'ring' sweated in place to fill the void. Then machined to fit the new cartridge rim dimension. I use .590" for Rigby sized cases. You can go .595".</p><p>Then the ejector hole is filled and the bolt face is machined for the new headspace.</p><p>Another option is a bolt replacement.</p><p>The problem going from a .550" diameter case to a .588" diameter case is that it is almost a given that metal will need to be removed from the feed ramp, this is part of the bottom lug abutment.</p><p>If it is not done, it will most likely feed badly.</p><p>All of the factory 338 Lapua rifles I have seen had dual ejectors, I do not know why, but Remington felt they required it.</p><p>It is NOT what I would do.</p><p>As to the lug setback, this IS a very real possibility if the feed ramp is altered or the action is altered behind the abutment.</p><p>I went through this dilemma building my 338-416 Rigby Improved.</p><p>I shyed away from a Rem 700 action and used a CZ 550 Safari Magnum action instead, it started life as a 416 Rigby anyway.</p><p>This is the info you need to mull over, is it a deal breaker? That's up to you.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2316550, member: 10755"] 2 things come to mind doing this conversion. 1) removing metal from behind the bottom lug abutment to lengthen the magazine should be avoided. 2) the bolt face requires bushing, the plunger ejector hole filling and a M16 or Sako style extractor fitted. So, after removing the factory extractor, the bolt gets a ‘ring’ sweated in place to fill the void. Then machined to fit the new cartridge rim dimension. I use .590” for Rigby sized cases. You can go .595”. Then the ejector hole is filled and the bolt face is machined for the new headspace. Another option is a bolt replacement. The problem going from a .550” diameter case to a .588” diameter case is that it is almost a given that metal will need to be removed from the feed ramp, this is part of the bottom lug abutment. If it is not done, it will most likely feed badly. All of the factory 338 Lapua rifles I have seen had dual ejectors, I do not know why, but Remington felt they required it. It is NOT what I would do. As to the lug setback, this IS a very real possibility if the feed ramp is altered or the action is altered behind the abutment. I went through this dilemma building my 338-416 Rigby Improved. I shyed away from a Rem 700 action and used a CZ 550 Safari Magnum action instead, it started life as a 416 Rigby anyway. This is the info you need to mull over, is it a deal breaker? That’s up to you. Cheers. [/QUOTE]
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Rem 700 RUM action safe for Lapua/Norma
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