Any ideas why?? Hp ss

Do you mean pellets are falling backwards out of the magazine or barrel when you retract the bolt? Or are the pellets getting stuck on the bolt probe and being pulled backwards when you cock the gun?? Trying to understand.
Did you lose a breech o-ring? Are you single loading pellets without a magazine?

Make sure you're not accidentally loading smaller caliber pellets. Check your tin carefully. Mistakes do occur in packaging.
 
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