I recently used the Brownell's chamfering tool on several Model 686's, just breaking the edge at about 45 degrees all round, including the extractor. They still extract correctly, and the slight break seems to help in reloading. Personally, I do not chamfer my own revolvers unless I am interested in speed reloads. The ones I use for speed reloading all happen to be done at the factory and I did not need to do it. If I had, I would have done less than they did, and they should know how much can be done.

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Richard Gillespie
FBINA 102