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My gun was shooting awesome groups at 50 yards then all went to hell, I figured the scope got bumped so I went to sight it in and im all over a 12" square target! I was shooting about 1.25" group, no idea what happened or what to look at, any help or suggestions would be greatly appreciated.

Guys I am new here, i just purchased this gun and sighted it in i then refilled the tank from a scuba tank and now when i pull the trigger i get a "hiss" of air released and the pellet is stuck in the barrel, i have re-cocked the bolt and fired but i just get a low pressure hiss ....any thoughts...