TexasCHLforum.com

If you get a rifle that shoots .22 shorts as well as long rifle, you can get what are called "CB Caps" for the lowest noise, or you can actually get a "CB Long", but they will not cycle an automatic action. These rounds usually have no powder as a propellant, and use just the discharge from the primer to propel the bullet. In a rifle you'll get 500 feet per second, and I've killed many a squirrel with them, so I know they'll dispatch a skunk.

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Good luck!