Is browning or rust bluing period appropriate for a Woodsrunner barrel finish?
Rust browning and rust bluing are probably not period correct for the Woodsrunner, since rust browning likely first appeared in the 1780s or 1790s at the earliest, and rust bluing (essentially a boiled version of rust browning) came about the same time or a bit later. Modern hot bluing is also not period correct. For the Woodsrunner's actual period, appropriate options are limited to charcoal bluing or leaving the barrel in the white, since heat bluing and modern hot bluing are not options here.