I had a great uncle who excelled at making a wild game gumbo which included Squirrel heads. He would fish around in that pot until he fond the heads and crack them like nuts to get at the brain. To each his own, though. I like the .17M2 for squirrel hunting late in the season, because I can make long shots with it. Early on I like my NEF 12 gauge single shot with #6 shot. With a rifle I aim just behind the shoulder.
God bless the U.S. Cavalry