The only thing I tried through it was Nitro's #7. I can't give you an exact pellet count, but it had an awesome pattern at 40 yards. I bought several boxes of federals on a deal, killed three turkeys with them. That choke with the Nitro's may be just as good as the Tempest and the Federals, but I just don't like to change up. It has had probably had seven rounds through it. It looks rough in the picture, but it is in great shape.