CBL1 I just had this done and am very pleased, I shoot sporting clays and the best I could do on my home course before was 72 after haveing it done I shot 86 and 88. I had .015 jug put in both barrels that measure .735 bore size. The plan was to pattern it after I had it done to compare to the pattern sheets I did before but we have 14 inches of snow so it will have to wait. Mike Orlen did the work by the way. Hope this helps. Mike