I use Rem. 3" Duplex 4x6 backed up with Rem 3.5" #6 and Rem 3.5" #4 out of an 870 Supermag with a M.A.D. Max .665 (i think) choke.

I've killed them at out to 55-60 yds. Average shot is 20-30. I probably wouldn't try to shoot them so far away if they weren't so darn tasty ; )