One that I carried quite a bit was an old Savage 99 take-down in .22 Savage High Power. That is certainly too powerful for trapped animals but I also carried a couple of the Marbles Auxiliary cartridges which allowed .22 Shorts to be fired in the rifle. Most of the time I used CB Caps with it. A fine combination that allowed me to have the power of the rifle if I needed it. That, of course, was some time ago...