Ha ha, interesting you should say that, I saw John Brownings rifling setup at the Browning museum in Ogden Utah. It used a wooden rod about 5 foot long, from memory, with a single slow twist thread cut along it, to drive the cutter. He operated it by hand, walking back and forth the 5 or so feet hundreds of times. They reckoned he walked 12 miles or something to rifle each barrel!
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