Gentlemen,

About four or five years ago I had some correspondence with Lee Jurras who has built his Jurras Howdah Pistols on highly modified Contender frames in 577, 600 and 12 bore / 730 calibers. At the time he was building only long range rifles but he told me (in his very warm and friendly way) that he could still build the howdah pistols if someone wanted on the Contender or Encore frames if someone wanted them.

I also know that NE forum member Bigdog had / had a 600 Nitro Express Encore custom pistol which was built for him just two or so years ago.

Not sure what the regulations are but someone could check with Mr Jurras or Bigdog and find out as one used to build Modernised Howdah pistols and the other has a significantly bigger than 51 cal pistol that he shoots.

And, of course, now that you have this information, whoever has one built would be duty-bound to post pictures here once they start on this project.

Very good hunting!