Mehulkamdar,

What about the Sabatti slugster gun? It is designed to be used for boar, but I think it can actually take care of much larger game. Also, I think they might be interested in adding rifled chokes (currently the gun is sold with cyl/imp-cyl fixed chokes).
Wouldn't it be a great gun to carry afield?

Fred

http://www.sabatti.it/ita/framesetgiustapposti.htm