CCI's.22 Long Rifle Shotshells with 31 Grains of #12 shot at 1000 fps are a great choice for dispatching small vermin. Rigid plastic shot capsules that breaks on the rifling Flexible base wad prevents gas blow by Reliable CCI priming Residue removes with normal cleaning methods. CCI rimfire ammunition goes through a demanding test regimen which insures lot-after-lot consistency uses clean-burning propellants keep actions cleaner has sure-fire CCI priming and comes in a reusable plastic box with dispenser lid.