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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6mm advice wanted
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<blockquote data-quote="Trickymissfit" data-source="post: 429529" data-attributes="member: 25383"><p>I rebuilt two Coopers, and I can tell that they use a lot of nice parts, but that's where it ends. I'd go the Remington route before even thinking about a Cooper. And I'm not exactly big on "big green" these days. Savage chambers a 6BR, and probably others as well. I have a Mod. 70 chambered in 6BR with a no turn neck. No comments on the gun itself as I probably have not began to get the barrel broke in let alone find the perfect loads. Mine is a 1:14 twist Masker barrel that is a strait 1.25" @ 22" long. Never intended to ever shoot anything much heavier than 80 grain bullets in it right from the start (I built it as a 350 yard dog gun). Out of the box the 6BR is my gun for sure, but the HLS does it all in spades. It's an easy chamber to cut, and dies are easy to do as well. It's really nothing but a 6mm Remington made short. Or very similar to a 6XC but with the 6mm neck and Ackley shoulders (in OTW's the same round I shoot but with a longer neck length.)</p><p> I gotta agree with you in that I'd think a true safe load in the .243AI with 115 grain bullets is outta reach. You might get 3100 fps with 105's. And even then the neck length is not fun when looking at the full bullet range. A 3000 fps load in my 6/250AI took H1000 powder as well as Retumbo (I used that, but cannot confirm the velocity right here). On the otherhand the killingest round I ever own was a 6mm Remington. But never bothered with bullets heavier than 90 grains (it had the faster twist rate barrel). Using Berger 88's, it would shoot further than I had any business shooting. But out past 750 yards it was getting ragged due to velocity loss (a 6mmAI would have helped a bit, but a 1:8 twist barrel would have solved that problem).</p><p> Recently I got on a jones to built my own big six, and a couple juniors in a switch barrel concept (actually a two bult gun as well). I came up with my own design, only to find it was within .015" at the shoulder of the HLS. Thus a waste of time! The second one is a 6BR, but with a 1.218" shoulder deminsion, and the over all length being adjusted. The third is a short range round that is ment to use 70 thru 80 grain bullets. It's basicly a 6/47 (the small case) made made into a 6/222AI but with a shoulder length of 1.36". </p><p> </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 429529, member: 25383"] I rebuilt two Coopers, and I can tell that they use a lot of nice parts, but that's where it ends. I'd go the Remington route before even thinking about a Cooper. And I'm not exactly big on "big green" these days. Savage chambers a 6BR, and probably others as well. I have a Mod. 70 chambered in 6BR with a no turn neck. No comments on the gun itself as I probably have not began to get the barrel broke in let alone find the perfect loads. Mine is a 1:14 twist Masker barrel that is a strait 1.25" @ 22" long. Never intended to ever shoot anything much heavier than 80 grain bullets in it right from the start (I built it as a 350 yard dog gun). Out of the box the 6BR is my gun for sure, but the HLS does it all in spades. It's an easy chamber to cut, and dies are easy to do as well. It's really nothing but a 6mm Remington made short. Or very similar to a 6XC but with the 6mm neck and Ackley shoulders (in OTW's the same round I shoot but with a longer neck length.) I gotta agree with you in that I'd think a true safe load in the .243AI with 115 grain bullets is outta reach. You might get 3100 fps with 105's. And even then the neck length is not fun when looking at the full bullet range. A 3000 fps load in my 6/250AI took H1000 powder as well as Retumbo (I used that, but cannot confirm the velocity right here). On the otherhand the killingest round I ever own was a 6mm Remington. But never bothered with bullets heavier than 90 grains (it had the faster twist rate barrel). Using Berger 88's, it would shoot further than I had any business shooting. But out past 750 yards it was getting ragged due to velocity loss (a 6mmAI would have helped a bit, but a 1:8 twist barrel would have solved that problem). Recently I got on a jones to built my own big six, and a couple juniors in a switch barrel concept (actually a two bult gun as well). I came up with my own design, only to find it was within .015" at the shoulder of the HLS. Thus a waste of time! The second one is a 6BR, but with a 1.218" shoulder deminsion, and the over all length being adjusted. The third is a short range round that is ment to use 70 thru 80 grain bullets. It's basicly a 6/47 (the small case) made made into a 6/222AI but with a shoulder length of 1.36". gary [/QUOTE]
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