I recently decided to rebarrel my 6.5-06 AI and figured since everything was custom, I might as well try to make some improvements. I was interested in the Gibbs case, but didn't like the short neck. I had Pacific tool build a reamer based on the .270w case. It has the same case capacity as the Gibbs case, but with a much better neck. Early results are VERY encouraging with 3200' with a 140 berger in a 26'' barrel. Accuracy is very good as well. Case capacity is identical to the WSM case with like brass. Anybody have any favorite data for the Gibbs or similar? Thanks/Rich
p.s.I increased velocity over the ackley case with the same length barrel by 100 fps.
Last edited by elkaholic; 07-17-2009 at 06:09 PM.
Reason: additional info
I have the 264 gibbs and the 7mm JRS necked to 264 which is all you can get out of the 280 case. I can drive the 140 just over 3100 fps in both with a 26" barrel but the best accuracy and case life is under 3100 fps. I am having good luck with magpro powder since it came out. 7828 does pretty well. Most powders in that range are pretty good.
Predictions are difficult, especially when they involve the future
yeah, I am pushing it pretty hard, but after cutting the throat long enough to seat a 140 berger to the base of the neck and just touch the lands, I now get around 5 firings from a case before the pocket is gone. accuracy is acceptable for its purpose, last time out it was holding 8" groups at 1060 yards, from a bipod with a rear bag.
Thanks guys.........I've had good results with 4350, 4831, re22, re25,7828,retumbo, magpro, and even t870. All will get into the 3100+ range. Top velocity was with re22 @3213'. I might be able to go a little more but I don't like loose primer pockets. So far I've fired the same brass seven times (including fire forming) and the cases are still good.
i was just wondering... wouldn,t a 264 win mag accomplish the same velocity's without the hassle of making your own brass ? i'm not up on all the tech stuff like you guy's are , but was wondering why you don't see more 264 win mags being used for long range shooting? kinda been kicking around the idea of having a 6.5 built , so any info on the 264 would be appreciated