What would be the proof and service pressures for a 16 gauge black powder proofed double gun in 1860 to 1870? The gun has decent barrels but don't know what type of loads I'm looking at using. Not going to load black but I can load nitro powders to fairly low pressures. Other option is to have Briley fit a set of 28 tubes in it but I hate making any double swing like concrete on a post.
This is a conversion and I think it started out as a muzzle loader, then converted to pin fire and now center fire. Good barrels must have been prized or it was owned by one frugal owner. Needs a fair amount of work but well worth saving.
