I've got RAR-Predators in 204, 223, 22-250, 243, 25-05, 260, and 6.5 Creedmoor that all seem to feed, fire, and cycle just fine. Except for the 22-250, the rest are MOA or better shooters with the 204, 243, and 6.5 Creedmoor being particularly good shooters.