With these snap caps, you can teach or learn safe Black Powder Cartridge or Smokeless gun handling. Competition shooters can practice speed at home. Hunters, don't miss a great shot fumbling for ammo. Eliminate flinching, or break in a new action. These tough dummy cartridges take repeated cycling and dry firing! These snap caps can be fumbled, dropped or jammed without fear. Many will work in more than one caliber gun, i.e. 45-70 in a 45-90 etc. Available in many more calibers then listed, so If you don't see the caliber please ask as they may be available on special order.