I think we would all be better off to have a gunsmith setup the barrel in a lathe so they can cut perfectly perpendicular to the lands. Then they can slice it off and recrown with a bit an cut a perfect recessed 11 deg crown.
This is like $50 to $75, I believe.
....or, I can buy hand tools which I can misalign to the bore, or have an original cut so far off that I struggle to cut the crow and have to buy something else. To some level, this method requires a perfectly square cut, which is impossible by hand. Out of square has the cutter bound only by the tightness of the pilot.
I think this method costs me $150 or so in tools??