brian: as i recall, only those shotgun actions with double under lugs and a greener type cross bolt are considered strong enough to handle high pressure rifle calibers. there is a wonderful book written by w. ellis brown which goes into this subject in much detail. the title is "building double rifles on shotgun actions". the publishers web site is bundukipublishing.com. also, if you do a web search for w. ellis brown you will find lots of info re building double rifles. good luck with your project. ed
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