Mine is a 2018 with the LW barrel and I shoot .25 heavies and it was doing the exact same thing. The problem was that the pellets were too loose in the magazine and the were getting blown backwards and when the mag rotated they were getting deformed. My fix was to flare the skirts on the pellets so the fit snug. Problem solved.
What did you do to flare the skirts just push them in with another pellet once in the mag? I really do not feel like flaring skirts for every pellet I want to shoot lol
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