long time ago I shot some soda cans with CCI shot loads, at 10 feet or so - .22, .38, and .44. The .22 is quite unimpressive. The .38 is better, the .44 shreds the can. Go with the .38 loads, bare minimum.

Afield this S&W usually has at least one shot load aboard:

[Linked Image]

"...the designer of the .270 Ingwe cartridge!..."