I have a Mossberg 500 smoothbore with rifle sights. It shoots Winchester rifled slugs into a 2" group at 50 yds. I'd shoot a deer out to 75 yds, after that it's the sights and my eyes that limit my effective range.

You will see zero pattern if you shoot buckshot through a cylinder choke, which is wht my 500 barrel with rifled sights has. I tried a couple shots at a paper plate at 25 yds. One or two pellets hit the plate.