Foster style slugs are hollow based so they will swage down through any choke. You should have no problem in your gun with the Foster style.

On the other hand, your rifle will knock them right down at close range as well as long, and its velocity is low enough to prevent a lot of meat damage. I would be inclined to use the rifle bbl regardless of range - saves having the deer step behind a bush while you're thinking about which barrel to use.