22 round beat the alternative. The youngest .22 rimfire cartridge is the .22 Winchester Rimfire (WRF) Magnum round that was developed shortly after World War II and it is the only member of this ...
22 ammo (mostly .22 LR, but with some .22 Winchester Magnum Rimfire [WMR] thrown in for good measure; the former can be used in my beloved Beretta M9A1-22, but not the latter). With that in mind ...