I use the Federal 22lr rat shot. They are crimped at the end of the case, don't have the plastic dome. They don't hold as many shot, by weight, but I believe they pattern better. I know that I kill more of the wood boring bees with them. And, they work on snakes, too.
Good thing about the King Snakes..... there on the job 24/7 and you don't have to replenish them.
