> > Most pistol ammo is subsonic if I recall correctly. It's a tossup. 45 ACP is generally subsonic. So is 38spl. Most 9mm under 147gn is supersonic, as is 357, 41 and 44 magnum. 44 Special is not, nor are several of the mousegun calibers. 22 LR is generally supersonic, except for 'standard' velocity and target.