Do Canadians eat slugs? I thought snails were a Frenchie thing. Or you talking about the shotgun variety... in the army we called those knock knocks, as in door openers. Guess they work well for bears huh?
If you rack the slide for someone that gets at least 70% of people to leave , if the first 2 rounds of bird shot don't convince them , next coming out is buckshot , if there still coming i know the slug will stop them . And if it has to come to that its going to be a very slow moving target .