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Try this old saved message. Is it you?
PS. The mold lapping experiment didn't work out so well as I recall. I got it egg shaped in cross section.
This works fine for both steel and aluminum molds. I have used "Clover" ultra fine lapping compound to do this. Take your time though, dont try to take too much off at once. I would suggest getting an accurate inside Mike, and take a couple test readings before starting, then lap, flush out, read again, etc. You will probably have to have a couple laps handy, as they do wear. I cast a few out of zinc when I did a Lyman 475gr Spitzer that dropped 454 bullets instead of .459 Took two laps to get the job done, and about 15 minutes
Good luck Gunner
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