I have a Merkel sxs 12g "Made in GDR" shotgun I suppose I could convert that. I was thinking of .405Win calibre I know this is not a British calibre but a few British doubles were made in this calibre. What British calibres would be suitable for a Howdah? Most are to big and powerfull to be used in a Howdah pistol or they are to small . any suggestions?
RLI