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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
input on 6mm something or other coyote rig build
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<blockquote data-quote="Trickymissfit" data-source="post: 736410" data-attributes="member: 25383"><p>I can push a 105 grain Amax right at 3000 fps with no pressure signs at all in my 6/250AI. I'm planning a shade tree rebuild of the barrel this spring, but nothing major. I'm going to run a 6mm Ackley reamer in the barrel to where the over all length comes out at about 2.020. I still can use .243 Lapua brass, and will end up with about a .030" longer headspace number. I get about .04" case shrinkage during firforming (I finally did a serious check on fire formed cases last week). They're comming in at 1.885" overall. Add .04" and you are seeing about 1.925", or right on the 22-250 overall length. With a .243 case, this gives me .115" to play with. The Ackley reamer is setup for a .35" neck length. The shoulder deminsion I'm working with is 1.512", and I think that </p><p>1.540" will put me right there. Not quite a 6BG, but also easier to do. I really wish the Ackley neck was in the .32" area, as then I could build it as a 6BG with a 40 degree shoulder.</p><p> </p><p>I'll simply run the reamer into a Forster seater sleeve, and be done with it! The sizer is a different animal, and will probably have to build one or have one made by Harrell. Anyway the chamber should completely clean up, and the increased neck length is what I'm really after right now. The hard part will be chasing the original barrel threads, but done that hundreds of times in the past. (may already have enough thread on the O.D. anyway)</p><p> </p><p>Speaking of AR's. Never over look the 6x45 round. It will push an 85 grain bullet to about 2800 fps in an AR (near max), and the 70 grain bullet to close to 3000 fps. I had an AR once with this chamber, and it was very accurate.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 736410, member: 25383"] I can push a 105 grain Amax right at 3000 fps with no pressure signs at all in my 6/250AI. I'm planning a shade tree rebuild of the barrel this spring, but nothing major. I'm going to run a 6mm Ackley reamer in the barrel to where the over all length comes out at about 2.020. I still can use .243 Lapua brass, and will end up with about a .030" longer headspace number. I get about .04" case shrinkage during firforming (I finally did a serious check on fire formed cases last week). They're comming in at 1.885" overall. Add .04" and you are seeing about 1.925", or right on the 22-250 overall length. With a .243 case, this gives me .115" to play with. The Ackley reamer is setup for a .35" neck length. The shoulder deminsion I'm working with is 1.512", and I think that 1.540" will put me right there. Not quite a 6BG, but also easier to do. I really wish the Ackley neck was in the .32" area, as then I could build it as a 6BG with a 40 degree shoulder. I'll simply run the reamer into a Forster seater sleeve, and be done with it! The sizer is a different animal, and will probably have to build one or have one made by Harrell. Anyway the chamber should completely clean up, and the increased neck length is what I'm really after right now. The hard part will be chasing the original barrel threads, but done that hundreds of times in the past. (may already have enough thread on the O.D. anyway) Speaking of AR's. Never over look the 6x45 round. It will push an 85 grain bullet to about 2800 fps in an AR (near max), and the 70 grain bullet to close to 3000 fps. I had an AR once with this chamber, and it was very accurate. gary [/QUOTE]
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input on 6mm something or other coyote rig build
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