CCI shot works just fine...
A few years ago I was camping at a Tucson RV park. I had just returned from checking the pattern of CCI shot from my 38 snub at the local range, and was cleaning my revolver at my picnic table. I was disappointed at the large spread at 5 yards, couldn't see how the shot would be effective on snakes.
My neighbor walked over and said, "You know you aught to get some shot shells for your walks in the desert." Turns out he lived his entire life (80+ years) in Texas and Arizona, including many years in the Boarder Patrol. Said he had killed hundreds of snakes with his 22 snub and snake shot over the years. He thought it was the shock of several pellets all hitting at once. Said if the first shot didn't get the snake, just walk closer and shoot again... after one, it wouldn't be going anywhere.
Said, "but of course, that was before shooting rattle snakes was illegal..."
Will