Crown a barrel by hand vs doing it on a lathe. Custom Mauser. How close can you get it by hand. I was able to get within 0.003-0.005" by doing it with hand files and sand paper. This was not the final crown at the end, but a clean up cut to see how much we needed to take off to clean up a hand cut crown on the rifle barrel.

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Mill bastard file: https://amzn.to/2PT61xY
Smooth cut file: https://amzn.to/2VWC4mi
Machinist square: https://amzn.to/2YqR8Gv

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