Originally Posted by
Bent Ramrod
It looks like the cylinders in the bottom picture are real rifling heads, for various calibers. I think I can see the cutters in the windows on the sides. They should be a single "hook" or scraper. Where there long rods, or a rifling machine, in there with the old gunsmith's "stuff?"
The "saws" in the first picture were typically inletted into a Babbit casting made in the old barrel, replacing one of the "lands" cast by the rifling grooves. The casting so fitted was pushed through the barrel, indexed to the next groove, pushed through again, and so on until all grooves had been scraped. Then a piece of paper was put under the saw and the process repeated until the worn grooves were "freshed out."
Another casting might be made and this time the saw was inletted into the groove in the casting, made by the bore of the gun, and this assembly pushed through until the worn tops of the lands were evened out. A new ball mould would be made to fit, and the gun was ready for another campaign of shooting.