Defariswheel: I had my first one done by a gunsmith who did not bevel the extractor. Worked good. I had to have that cylinder replaced, and the factory beveled the extractor as well and significantly cut the edges. Every gun I have from the factory with beveled chambers has beveled the extractor as well as the cylinder chamber openings. That includes two PC 627's.

I vote for your method. I think less is better when opening the chamber mouths. Just breaking the edge would be enough.