6.5 grendel necked down to 6mm.... I know it's been done, I've read some stuff that I have found playing around online... Has one here personally done it, have any experience with it? I know some call it a 6mmAR, then ackly improving that on top of it all... It has spiked my interest for a few years now... I have been running a 6.5 Grendel that I built a few years ago and it's just been one of my best shooting guns I own still to date. No benchrest stuff here, no competitions, just looking for input on maybe doing this. I'm a sucker for the little cases like this, but I still dont even own a 6br haha!