When i recieved my Guntlet, I was pleased with what I saw. I cleaned the barrell completly. Started with jsb 15 gr at 25 yards. After sight in. The pattern was kind of spread out, shot about 60 rounds. Then switched to 18 gr. And the pattern was tighter but was a little disapointed. Continued to shoot , at around 200 rounds it fell into a 1/2" hole. The 15gr were shooting at 820 fps and 770 fps with 18gr. So i upped the reg pressure to 1450psi. That netted 15gr 888 to 879fps. And the 18gr at 856fps to 842. And the groups were still good with the 18gr. The 15gr seamed to get a little unstable at that speed. But the gun didn't like the 15gr anyway. May try some heaver pellets and see what happens. > will update.