Canada,
It doesn’t show well, but there is a solid layer of pits that the bluing gets into and retains that bluing better.
It definitely looks like an older, well taken care of barrel. It’s a lot of work, but looks real good.
It is my go to finish and wood look great on your Fowler.
Browning can be a great finish as well, and can produce a myriad of finishes from a textured, almost leather grained finish, or can be smooth as glass plum purple, it can also be turned black.
All depends on the process.