I've got one of the 22 250 fluted barrels,and was very dissapointed with the factory ammo.(4" groups) But the first handloads with the 40 B.T.'s and 40 grs. of IMR 4064 went into 1/2". I don't know if it will do it consistanly or not since I put it up and started shooting another barrel. Demag 41 tried the same load,and it did'nt work for him. Digger