I forgot....another way to 'trap' them is with plastic bird netting....not spread out, but bunched up. They poke through the holes, get caught, and can't back out. Given, of course, they are the right size for those holes. I had a friend discover this when she found snakes in a bunch of...
sjhorse....you can still get 'snakeshot' for a .38, I have some for mine.
The little shells are cylindrical rather then being pointed on one end, and the ones I have are silver color with a clear blue flat topped cap...you can see the little pellets through the cap.