When I had one rifle that I used for hunting and field target it was the obvious choice for a caliber larger than .177. At the time CPs ruled the day and both the .20 and .22 versions weighed the same at 14.3 grains. Since the .20 had the smaller diameter, it had higher sectional density, higher BC, flatter trajectory, and better penetration on game. It still has some advantages as you can see here.
Due to the relatively high BC energy retention and wind drift are quite good, and drop is not bad either. The BC was determined from my own testing of the JSB pellet shot from my .20 Daystate Harrier which was tuned for a little over 20 ft-lb of energy at the time. At the muzzle I recorded an average velocity of 835 fps, and at 50 yards obtained an average velocity of 702 fps.