Those groups are crap probably because of the ammo used. Try CCI standard or Blazers, mine does raggy holes at 50 yards all day long.
It is possible that the rifle simply doesn't like the load, but I don't own a single gun that shoots Blazers or the CCI Standard Velocity as well as the SK Standard Plus loads. The SK Standard Plus is generally a higher quality, more consistent load. Below are a couple of five shot fifty yard groups fired with the SK Standard Plus loads


















































