Sounds like you are looking for an alternative to the classic Foster slug. Most will come in an undoubtedly champion Challenger, which is solid ammunition. I'd also look at Kent or Score slugs. I believe both use the "Thug Slug", which is a somewhat like a poor-man's Brenneke. Brenneke's are all but impossible to find up here, and expensive if found.
I'd used the Kent 10-point slug with zero issues. 3in., 1oz., 1750fps.