Actually the version that shoots the .454 Casull is only a 6 shot due to the pressures of the cartridge. I asked. The Lightweight versions (AKA the 7 shot versions are NOT rated for .454 Casull rounds and use of them, I'm sure, is strongly discouraged.
Here you go, unless the video is wrong. Could be, I hope not.
youtube.com/watch?v=JAgGFcrs5hI&feature=player_embedded