Townsend's sells 4 oz of flax tow for $5.50, compared to the $6.50 in the attached thread. 4 oz isn't much, if you use it regularly. It is washable, of course. I use hemp oakum that I get from the blacksmiths' stash at Fort Vancouver, primarily as tinder for demonstrating flint and steel. It seems to be a bit messy, though, with loose fibers that might be hard to fully clean from a gun barrel. The flax is really tough, and scours the barrel really well. Just try to tear it apart--a patch knife works better. I use it primarily for scrubbing the face of the breech plug.