Gotta put my two cents in. I have wade fished Florida with a 22 pistol loaded with CCI shotshells in it. They are loaded with #12 shot, also known as dust, and open a pattern about as big as a paper plate at 10 to 12 feet, very effective. They will not cycle a semi auto but will pattern well, and do no damage to a metal boat. I would want safety glasses on. Never needed more than one shot, and I've used it enough to be confident in it. Should it be non poisonous, I hope , for its own sake it has moved to more peaceful pastures.
Creativity is just intelligence fooling around