If you're using the shotgun primarily as a primary tactical piece then my vote is for single point. The gun is in your hands anyway and if you have to drop it quick for whatever reason it's still on you, right up front or at the strong side.
If you're tromping through the woods looking for dinner, then the standard two point sling will serve you well.
The Third Way: 3 point sling. Best of both worlds since you can put it around your body for tactical use, or over the shoulder for more pedestrian pursuits.
The only weapon is the human mind. Caliber varies.
Last edited by Big_T; February 25, 2010 at 08:32 PM.
Reason: Because I'm a moron who can neither spell or proofread