Thought them all to be doubles in 20 bore or larger - or 4 barreled ctg., like the 4 barreled Lancaster .577 Snider pictured and discussed in a Guns And Ammo magazine back in the late .60's or early 70's. No - I don't have the magazine anymore - me thinks.

Brother Tayor has a set of buggered 12 bore shotguns barrels shortened to 12" to obtain integrity that we've discussed in turning into a Howdah - probably smooth, but might line to a smaller bore - maybe .58 - probably not.

A single 8 bore would certainly 'work' as a Howdah, but alas, it is but a single.