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<blockquote data-quote="NesikaChad" data-source="post: 422945" data-attributes="member: 7449"><p>After building quite a few guns over the last 12+ years this is what I've pretty much whittled this sort of question down to:</p><p></p><p>1. Is or can the bolt face be altered to physically retain the rim of the cartridge?</p><p>2. Is or can the action magazine well/feedlips be altered to facilitate loading?</p><p>3. Is the ejection port long enough and can it be lengthened if its too short?</p><p></p><p>If yes is the answer to all three then give it hell.</p><p></p><p></p><p>In your case:</p><p></p><p>If the action you have uses a "T slot" style extractor then it's going to be a bit tricky to open the bolt face. It's not as simple as a guy would like. There are a couple things that need to be addressed. This particular extractor runs via a hole that's drilled in the face of the lug. A spring/plunger goes into this hole. It then drives a cone shaped (generally) countersink that is in the extractor. Opening the bolt face for a larger cartridge means that the extractor must move away from the center of the bolt face in order to be able to purchase the case rim for extraction and to be able to snap over the rim of the case when loading. The snapping action comes from the extractor begin able to slide back and forth in the T slot. </p><p></p><p>If I was head set on doing this then I would probably attack it by machining a pin to fill the hole that the spring/plunger goes into. I'd then solder the pin in place with some low temp stuff (so as not to kill the heat treatment of the bolt lugs) and then relocate the hole. Chances are the extractor will need to either be made over or modified as the radius is different on the case/extractor.</p><p></p><p>That's a push feed style.</p><p></p><p>If it's a CRF (control round feed) then essentially the same basic process will need to take place, although it'll be a little different. The bolt face has to get bigger and the extractor needs to be refitted to make the thing work right.</p><p></p><p></p><p>IMHO a magnum type cartridge that does NOT use a belt around the case web is always more desirable than one with a belt. They just run easier and the gunsmith chambering the gun can take advantage of a true headspace dimension instead of just using the belt. (Although I personally have all my gauges made so that I take a true shoulder/case head length when chambering)</p><p></p><p>What I would NOT do under any circumstance:</p><p></p><p>Have a Sako style extractor installed. I am very opinionated on this for safety concerns. I have a cardinal rule regarding them; I will not install or service a Sako extractor installed on a twin lug, 90* turn bolt action that uses a full length raceway.</p><p></p><p>The reason is simple. The extractor isn't supported by anything when the bolt is in battery. If a case ruptures that little bastage will come flying out and if it hits a person it's very possible to kill or critically injure that person. I know of two cases this year alone that resulted in surgeries.</p><p></p><p>Hope this helped.</p><p></p><p>Chad</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 422945, member: 7449"] After building quite a few guns over the last 12+ years this is what I've pretty much whittled this sort of question down to: 1. Is or can the bolt face be altered to physically retain the rim of the cartridge? 2. Is or can the action magazine well/feedlips be altered to facilitate loading? 3. Is the ejection port long enough and can it be lengthened if its too short? If yes is the answer to all three then give it hell. In your case: If the action you have uses a "T slot" style extractor then it's going to be a bit tricky to open the bolt face. It's not as simple as a guy would like. There are a couple things that need to be addressed. This particular extractor runs via a hole that's drilled in the face of the lug. A spring/plunger goes into this hole. It then drives a cone shaped (generally) countersink that is in the extractor. Opening the bolt face for a larger cartridge means that the extractor must move away from the center of the bolt face in order to be able to purchase the case rim for extraction and to be able to snap over the rim of the case when loading. The snapping action comes from the extractor begin able to slide back and forth in the T slot. If I was head set on doing this then I would probably attack it by machining a pin to fill the hole that the spring/plunger goes into. I'd then solder the pin in place with some low temp stuff (so as not to kill the heat treatment of the bolt lugs) and then relocate the hole. Chances are the extractor will need to either be made over or modified as the radius is different on the case/extractor. That's a push feed style. If it's a CRF (control round feed) then essentially the same basic process will need to take place, although it'll be a little different. The bolt face has to get bigger and the extractor needs to be refitted to make the thing work right. IMHO a magnum type cartridge that does NOT use a belt around the case web is always more desirable than one with a belt. They just run easier and the gunsmith chambering the gun can take advantage of a true headspace dimension instead of just using the belt. (Although I personally have all my gauges made so that I take a true shoulder/case head length when chambering) What I would NOT do under any circumstance: Have a Sako style extractor installed. I am very opinionated on this for safety concerns. I have a cardinal rule regarding them; I will not install or service a Sako extractor installed on a twin lug, 90* turn bolt action that uses a full length raceway. The reason is simple. The extractor isn't supported by anything when the bolt is in battery. If a case ruptures that little bastage will come flying out and if it hits a person it's very possible to kill or critically injure that person. I know of two cases this year alone that resulted in surgeries. Hope this helped. Chad [/QUOTE]
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