Originally Posted by robocop10mm
I have taken a case and cut the mouth into a 4 toothed hole saw kind of arrangement. Slide it over the bullet and shave it til it reaches the case mouth.
This may be a winner, entries, however, are still being accepted.
I made a quick prototype.
1. Color Sharpie on rim to mark original Depth of Cut on rim.
2. Triangle file across case mouth (both sides) at 90 degrees to make recess.
3. Mill File angled against back of notch, preserving rake on marked rim
I used a fired case to approximate correct I.D.
Will need to bell the toothed mouth a bit to increase I.D.
Should work. My close up shot looks like a sharks mouth. egads!
I may need to use a ceramic stone for my last dressing of this surface.