Listed below are links to some sites related to shotgun sports for gun enthusiasts that might be of interest to you:

Beretta          Browning        Krieghoff         Remington        Winchester

Ontario Out of Doors        OPTA        NFA        Shotgun World       Birchwood Casey

Firearm Buy & Sell       Firearm Safety Education      GunPost

Canadian National Sporting Clays Association        Shotshell Cost Calculator