Mine sure is. I have tried several of the RWS line in this gun and it didn't group better than 3" at 50' with any one of them, not even Meisterkugelns. Guess what it does like? Crosman Copperheads, which I am not even sure are still available in .22. I had an old, plastic box lying around, that I bought at a mom n' pop store years ago. They are wadcutters, and grouped about 1" at 50', just fine for open sights and shooting birds/pests. Other B-21 owners, what pellets are giving you good accuracy results?