I was wondering if there's a difference in muzzle velocity for a given round of .22lr when fired from a rifle vs. a pistol. I want to use sub-sonic ammo for practice with my pistol at a nearby desert and I'm wondering whether the Remington ammo I have (which lists its muzzle velocity as 1280fps) would fit the bill if fired from a pistol, or whether I should buy actual subsonic ammo.