Revolver Speedloader - .38/357 Caliber. A Series Speedloaders - No cartridge jiggle, popular twist knob. Loads cartridges into revolver instantly. Super-Fast, Super-Dependable. Why load your revolver one cartridge at a time? With one slight twist, the HKS Speed Loader instantly loads all six cartridges into nearly any revolver. The principle is simple: Strong metal points hold cartridges securely in the loader until you release them into the revolver with a turn of the speed loader knob. .38/.357. S&W 10, 12, 13, 14, 15, 19, 64, 65, 66, 67. Dan Wesson / Charter Arms / Taurus 606, 65, 66, 80, 82. Rossi 971, 951. 851, 351.