For the most part, the only pellets I use these days are FTT/ Accupell FT and I find them very good in all my guns. I did have something odd happen though when I purchased my HW100. From research it seemed like AADF was a very good pellet for them and when I purchased the gun I got a tin to try. Zeroed in and it was ringing the bell at the indoor range with every shot. Plinked with friends a few days later and used FTT as I had bought a dented tin cheap and assumed being cheaper than AADF they wouldn't be as great a pellet (Yes I know now ). Obviously the zero was off but they did ok for that session with some compensation. When I went back to AADF I noticed it was no longer making a single tight group, rather 3-4 small ones. No amount of barrel cleaning helped and now it's diet is almost exclusively Accupell FT (FTT seemed to be fouling the barrel up after some shots but not so much with the lubed FT's ).