I'll make two observations .
1 Most foster type slugs are undersized and seal by expanding the hollow base similar to a hollow base wad cutter in a pistol. Thus they will work thru even a full choke w/o issue
2. The browning deer slayer auto 5s were considered to be excellent slug guns. They were nothing more than �uto 5s fitted with barrels with rifled sights. No reason your 16 can't handle slugs. I'd use the high base setting.
