I have never had any luck with those CCI shotshells. When I was a kid you could get the crimped Winchester rat shot or several brands that had a sort of clearish red or blue rubbery plastic with the shot directly impregnated in it. Some you aimed at the target, some you aimed at the ground next to the target and the shot capsule would break and blast the snake. CCI shotshells are like a crappier version of the second kind. They are usually the only ones I can order, though.