Thanks much, guys. Very helpful info from all of you. I'll call a couple of local smiths today and see if any of them are familiar with testing these critters. If it passes, cool, and I'll prolly start handloading with all brass shells and < 3 dram, one ounce or lighter loads. If it fails the inspection, I have a cool $140 wall hanger to go with my great, great granddad's .36 cal flintlock.
Thanks again!
Also, I'll just run this by you guys first, but I've always been pretty good at fabrication, and have all manner of lathe, mill, mig, tig, torch, etc., and it has occured to me that there's no reason the receiver couldn't handle modern ammo if the barrels are up to it. Sooooo.....my other idea is to get a pair of 12 gauge, 3" barrels for the NEF shotguns (18" cyl bore), braze or spot-tig them to a center rib (perhaps even band them), and then mill a block of steel to fit the Bayard and so attach the barrels. After all, what I really want is a twin hammer coach gun that is NOT China-made like the brand new Cimarron I just traded off for that reason. I just can't afford the $1k CZ right now.