Mossberg 9200 12 gauge with 18 1/2" barrel, rifle hi viz sights, full choke, 4" - 6" consistently at 100 yards with both Brenneke and Foster slugs. I might lose a little velocity but the deer will never know the difference. My other shotguns I shoot slugs with use IM chokes because that works better for them, most any choke between IC and IM will work, just experiment to see what flavor your gun likes.