I would like to know what the slug regulate and hunt with?And
how many does it take finish the regulate with?

Will, do you mean using slugs in a double-barrel shotgun? Regulation will be a matter of luck, unless you plan on separating the barrels and resoldering them. I'd try a couple slug types and see how their POIs print. If you're looking for 40-50 yards minute of Whitetail, you may be OK.