Rebarrelling or relining a Trabatier musket/Zulu shotgun

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I acquired a decent approximately 12 gauge bp cartridge Zulú shot gun. Given its bore size can it be relined and rebored legally as a rifle or should I stick to relining it as a smoothbore or perhaps rebarrel it. Also, it appears I could drill and tap the firing pin hole for a percussion nipple. That would allow a clear flash channel that could be used to direct the cap flame directly to the back end of a 12 gauge brass cartridge shell charged with bp where you would normally have a shotgun primer...kind of like a bp smith carbine cartidge but in brass rather than a rubber cartridge case.
 
James
I am looking for a smith to help me on the inspection and possible relining/re-rifling of the barrel. I was asking about the legal aspects since I didn't know if putting a MODERN rifled liner greater than .50 " bore would be ok regardless of its age.The Zulu shotguns began life as a French M1853/M1857 MLE front stuffer rifled caplock musket main battle rifles. Circa 1866-67, they were converted to M1867 fixed cartridge breech loaders (Trabatieres) using a patented breech whose patent was shared by a Frenchman named Schneider and American Jacob Snider (who invented the Snider breech conversion for the British Snider Enfields). The main difference between the two being the breech being hinged on the right or left. During the Franco-Prussian war these were replaced by the Chassepot, but were still used as a second line battle rifle. After the war a number of Belgian gunmakers bought most of the Trabatieres from the French govt. as govt. war surplus, bored them out to smoothbore to approx.12gauge forselling as Zulú or Hunter branded single shot shot guns. They were dirt cheap @ $3 each in the mid 1870s and shipped all over the world, even to the US Western frontier from the Sears Roebuck mail order catalog in the 1880s. As time progress production of newer and almost ad cheap double sxs cartridge 12 gauge replaced the older Zulu single shots.Good originals of the rifled Tabatier can go for over $1000, since almost all of them were converted to Zulu smoothbore shotguns. The Zulus over the past several decades were quite numerous and cheap until recently, but now they seem to be increasing in price, but are still available for around $300.
Per the ordanance officer of the Grand Army of the Frontier, Missouri Division, I can shoot the bp cartridge Trabatier in the impression of a French infantry officer or enlisted infantryman during the Franco-Prussian war or a cartridge bp smoothbore in the impression of a Colonial French Legionaire scout along with my 1858 cb revolvers
 
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Ron
I would place a thin piece of gummed paper over the primer pocket like they do on Smith carbine reloadable bp brass or rubber cartridges. The channel for the firing pin runs in a straight line and exits right at the center of the shotshell primer picket. A hot cap should blow right through the paper primer pocket cover. I might have to cut the magtech brass 12 gauge shotshell down a bit to fully insert into the Zulu chamber. The Zulu breach block fully encloses the back of the cartridge. I could shoot the percussion cap Zulu conversion in exhibition shoots in the Grand Army of the Frontier musters/shoots since I would have to cap on the click for every shot...ditto for a paper cutter caplock breach loading Sharps carbine.
 
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I would stick to a low pressure round like 44-40 and see about bushing the firing pin hole and replacing the firing pin with one having a more modern tip. Also the 43 ramming to Egyptian was as I recall originally intended for France but France defaulted so Remington sold them to egypt
 
I was asking about the legal aspects since I didn't know if putting a MODERN rifled liner greater than .50 " bore would be ok regardless of its age.

I think the only concern you'd have about this is with the NFA "Large Bore Destructive Device" classification. As this is an antique gun, and there's no possible way to say that your home-made BP (excusing the expression) cobbled together semi-cartridge conversion plan uses readily available, non-obsolete ammunition, you are totally in the clear.

Build it into a 20mm anti-tank gun, and maybe you have a concern. A cap-fired one-off BP cartridge deal? No worries.
 
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