My mossberg 500 smoothbore will shoot 2-3/4" slugs really well. It can group good out to 100 yards. And from a solid rest can hit a paper plate at 125 yards all day. Most won' t do this good though. And I only use the double bead sight that came with my gun. 3" slugs don' t group good out of mine though.

The standard 835 barrels are overbored and can' t safely shoot slugs so make sure you get a " slugster" barrel.