I've had the HW97k for less than a year and when I first got it I discovered that the Crosman Premier Ultra Magnum Dome pellets shot great in it. In fact, they performed better than JSB 16 and 18 gr. They also beat out H&N sniper lite pellets so I was feeling mighty fine because I have at least 25 tins of Crosman UM domes. Well earlier this week that "magic" tin ran out and when I started a new tin, I'm getting mixed results. This new tin is so inconsistent. Some pellets fit snugly in the breech and they shoot fine, but some fit loose and they hit way off the mark. I'm going to pull out a new tin and hopefully I will get it back on track.