I have one with an Odin Barrel, and their billet upper receiver. Will shoot 77gr factory loads 1/2" consistently. Mag fed 5 shot groups. Will shoot 68gr Hornadys into half that. Barrel is bedded with loctite, in a trued receiver. It ain't no 22-250 by any standards, it is somewhere between the .223 and 250, but is in a nice coyote rifle, and sometimes they come in more than one at a time. It will sometimes miss the rim loading the first round if you don't pay attention. Feeds fine semi auto with a 6.8mag. I have been thinking of reforming some 6MM Hagar brass and using a 6.8 bolt, just to see what that does, but it is fine like it is. Beware: Rifles like this can cause a untreatable condition known as Evil Black Rifle Fever, or EBRF. It is uncureable and contagious.