I just switched to 245 powerbelts for my .50 DISC rifle. Using two 50 gr pellets, I get great 100 yard groups. However, my first shot after cleaning is much worse than any previous bullets I have tried, almost a foot low. After that I get a very satisfactory 3" avg. group. I have always believed in fouling shots but I have never seen such bad first shots. I can actually feel the difference in recoil as well. I am sure this all has something to do with the smaller diameter of the powerbelts but I am concerned that something else may be wrong. Has anyone else had similar experiences? Should I even be concerned?