AMB is right....no drop from the 48 22 in 30 yds....Next you need to target at 20 yds trying a variety of pellets to see which 5 shot group is tightest....then 30 yds...you got a great gun for hunting....I like the 18 grain crowmags for my guns best accuracy at 22 yds.
With a 48, you haven't even scratched the potential for 30-40-50 yards. If you can manage the recoil and hold all the way thru your shots (till target drops or is hit), you can shoot sub-1" all day waaay out there.