Daman, have a look at a Kreighoff Ultra, comes in 9.3x74 and with 20 bore shotgun barrels ! A lot of people are averse to the cocking safety but if you are not shooting dangerous game it won´t matter a hoot and a lot of PHs in Africa use them, see link below

http://www.krieghoff.com/ki/index.php?option=com_content&view=article&id=94&Itemid=88

best
Mike