4 gauge, Nitro Express, Nitro Express, Holland & Holland Magnum and a Smith & Wesson Magnum. If they made the 4 Bore or Nitro Express a R. ammunition that would be for when you want something extremely dead with extreme prejudious.
HOLLAND HOLLAND .700 NITRO EXPRESS - This ultimate elephant gun is just one of the many exquisite double guns in the Robert E. Petersen Gallery of the National Firearms Museum, www.nramuseum.com... To be featured in the upcoming book, Treasures of the National Firearms Museum (2013) - Rgrips.com
HOLLAND HOLLAND NITRO EXPRESS DOUBLE RIFLE: This rifle is engraved in deep relief with scenes of African elephants by Phillipe Grifnee. It can generate more than foot/pounds of energy in firing one of the projectiles of the Nitro Express cartridges.