I have an Odin Works 22 Nosler barrel that I put on a billet upper that I trued in a lathe. It is a true 1/2 Min gun that didn't costs much. It is also very close to that with Nosler 77gr factory loads. By very close, I's saying 90% of the time. On a good day when I'm not over coffeed out it will get down in the .2's with handloads. This is semi auto mag fed. Been thinking of forming some 6.8 cases and playing with a 6.8 bolt. I think the rebated rim is stupid, but it will shoot with most bolt guns. I have also been thinking of building another upper with an AR Performance barrel in one of their 6.5 or 6.8 wildcats with cavity back bullets for hunting deer, but just haven't gotten around to it. BTW the Odin barrel loves Hornady 68gr BTHP match bullets, and the Odin folks told me most all their barrels love this bullet.Hey guys. I’m really wanting to build a precision ar on a small frame. I’m probably going to go with a aero precision upper, lower, and atlas one 15” rail. This will be my first precision AR and I need some help deciding on what caliber. I’ve been looking at .224 Valkyrie, 6.5 Grendel, and 22 nosler. This gun would probably be mostly for target shooting and maybe shooting the occasional Whitetail. Any input would be really helpful on deciding this. Other things I’m not really set on are barrel make, length and twist. Any additional info on this would be helpful too. Thanks guys.