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I bought a target crown cutter from Brownells and added a .311 brass mandrill to ensure its centered with the bore. It worked great! I've done 4 rifles with it now and it shows no sign of wearing out.
Dave Manson has a military crowning tool which I've now used for a 1914 pattern Enfield and a 1950 SKS, both of which have tightened groups delightfully because of it. https://youtu.be/b23lfzpZrJ4