Re: most accurate long range shotgun.
Living in a shotgun only state, my buddy and I bought a couple of Savage 220's a couple of years ago. No problem getting 1 MOA out to 200 yards with a variety of different loads. On a good day they will print cover leaves at 100 yards. Mine really likes 2 3/4" Accutips, my buddy's likes Hornady SST's. I believe they are the same projectiles.
"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt