I do have a copy of the book and it does tell the story of a group of men capturing a mountain lion alive, placing it in a home-built cage and transporting it by horseback. My memeory is a bit foggy, but when I get home tonight, I will dig out the book and read the tale!
I do remember that the book has many old pictures of the period locals. I will look and see if any pictures show any people with firearms. Maybe I will find a picture of this thumb-buster!