22Man, different smiths will use different methods. You are correct about the muzzle being squared to the bore. In the past when I've done them by hand I used a piloted facing tool. A dremel can be used at the bore mouth but if you attempt it be very careful. Another way is to use a head of a round brass screw coated with lapping compound or some type of abrasive grease. You'll be money ahead to pay for it done. George
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