First pcp airgun

The pumping I completely understand. 3 pumps per shot really adds up. If there's a paintball shop close by, I'd probably go with a bottle first, then if you want, look for a compressor. I pay $5 per fill for my small bottle and get 12 or 15 fills on the gun. really brings fun of shooting back, instead of pumping. If you want shot count, and decide to try a regulator, do check with folks that already have the regulator to see what their shot counts are. Might be better to go directly to a bottle, and skip everything else, or might be best to get the reg. Your call.
 
So i'm having an issue, after each refill my gun is basically all over the place mostly about 3-4 inches right and some times high of where i was just hitting literally 5 minutes before hand. I'm assuming its either a scope or scope mount problem, its getting kind of frustrating. Just wondering if anyone has had an issue like this with their marauder it only happens after refilling the rifle. I basically only had one extra scope laying around and its the one i use on my marauder, its actually a pretty nice scope that has given me no issues before and its basically brand new so it has me kind of worried

just a note: the scope is a vortex viper 3-9 and burris scope rings