I am glad this post was started, and I have a related question… or a couple.
About 10 years ago I picked up an 1866 [patent date] Remington Rolling Block, with the year of production 1867, converted from Rimfire to Centerfire, with Express sights.
I do not remember which what country it came from, Sweden or Norway, and I have no notes, as it was a “I love Rolling Blocks, I will take it!” purchase, figuring I could always rechamber or rebarrel if I was going to shoot it. There are no state/country proofs.
I will also admit that, since the day I got it, I have yet to slug the bore, or to make a chamber cast- yes, bad on me- I really do need to order some Cerrosafe for the chamber cast… .
It has a Hexagon bore, approximately 12.54mm/.494" grooves (corners?), and 11.59mm/.457" across the flats. Did one or both countries use this bore type?
Looking at the dates, and the bore at the muzzle, what Rimfire cartridge would you guess it was, and which Centerfire cartridge would you guess it was rechambered for? I would like to end up with one of each, eventually.
Top Tang Patent 1866: