Defarbing

[Colt Fanning]

Howdy,
What do you use to Defarb (remove Black Powder only lettering etc.) from octagonal barrels?  Grinding, Draw filing, or milling?

Regards
Colt

[Major 2]

Draw file....  be care to stay the flats and card the file each pass to prevent build up a gouge the flat
hand grinding will result in cupped surface I think ,
unless it was surface grinding machine which would work
A mill would work...but I have no personal access to either...

[Flint]

IOf you use a mill, you need to shim the muzzle end to match the taper, as all these barrels are tapered.  It will most likely be easier to smooth and repolish a properly draw filed flat than to sand through the machine marks on a milled one.