We are selling 100 TPP 155gr .457″ round nose, hollow skirt pellets. We have tried several different pellets over the last few months that were not any better than anything else we could find on the market. So, we basically went back 150 years to proven round ball, hollow skirt ammo and it has worked very well for us. We are now approaching 1000 shots without a failure. The combination of shape, weight and proper sizing seems to have done the trick.