Its true you do not see as many rifles and pistols around in .20, but they are still available to buy. Two of my most accurate rifles are in .20, a Daystate XLR PCP, and a Weihrauch HW 95 springer. Also my RFD and friends do get quite a few Sheridans pass through their hands. The pellets I see on the shelves are H&N, Bisley, Kaiser, JSB. The .20 has quite a flatter trajectory compared to the .22 at extended ranges as it averages 100 f.p.s. more at our legal energy limit.

Baz