This video demonstrates the installation and use of the SureStrike™ 38SP/357 Cartridge. Just the drop the cartridge into the cylinder and start practicing. For our customers whose revolvers are chambered for 5 or 6 rounds, Laser Ammo sells the SureStrike™ 38SP/357 cartridges in packs of 5 and 6 so that you can continually pull the trigger.