thank you for your swift replies. firstly , using air arms field pellets, scope been remounted 2 or 3 times because tried other scope to see if it was scope issues, the gun was filled at shop , filled it to 190 bar, which is more than i would fill to, i usually fill to 170 , phantom you seem to know your stuff, this might seem a silly question but when you pack a scopes mounts when firing low do you pack at front or back ? by the way i'm new to all this forum stuff so bear with me if there are any mistakes.