Today we see rimfire cartridges for small game and target shooting. However, history shows it was the first practical, self-contained ammunition. Based on the old Volcanic rifle’s Rocketball cartridge, which was a caseless design, Horace Smith (Smith & Wesson) conceived a case with a hollow rim (balloon head) that contained the priming compound, fired by an off-set firing pin that crushed the rim. In 1857 he launched it as the 22 Short; and the rest is history!