Before I worry about ammo I would take your gun apart including trigger assembly and go over it carefully. Firing pin checked and cleaned with degreaser, don't lube it. Clean, oiled, scope mounts tight, scope leveled and snugged but not death grip tight in the rings. Stock screws snug but not gorilla tight. Barrel is installed in the receiver correctly:
http://www.brownells.com/.aspx/lid=1..._10_22_Barrel_
This is a 100 yard group from a pistol with that dreaded Remington Gold Bullet ammo that nobody likes.
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And this is a group ad 50 yards with one of my 10/22's with that same ammo.
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I do not think you have an ammunition problem but a gun problem.