What pellets are you using? Sounds like your pellets are 'flying' a bit. If you can try a selection of pelletsCheck that you have no pellet skirt protruding from the breech when you load a new pellet - if so you may need to re-crown your breech. How are you finding the 2nd stage of the trigger? The xs19 I have, had a long 2nd stage trigger pull and that could affect accuracy - remedied with a WW trigger upgrade.