RE: 410 buckshot
I've used them for coyotes, although they didn't really perform any better than slugs nor any better than the #4 shot I was used to running through it after them.
I've also loaded a few into this O/U Derringer .45colt/.410 that I had around for personal/home defense...they were a bit more than I cared to spend for that however, so once I ran out, I never bought another box.