ESquared wrote:The pic below is of the cylinder, post-cleaning, where you can see an example of where the aforementioned blasts have taken the bluing off of the front edge of the cylinder (in the same spot in every chamber) in a sort of half-moon shape.
Uberti 357 El Paton 1st Range Trip 3-1-19 011.JPG
This pic is of my .357 Police revolver. This spot shows the "worst" chamber on the cylinder. The other chambers have much less, one is close to nothing but a thin, straight line at the very front of cylinder. Have shot 125 rounds so far, exclusively Cowboy loads.

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I've called Stoeger Industries Service Department a couple of times with some technical questions about this revolver. The tech was very helpful, and explained things well to me. Actually, you'd call the CS of whichever company your revolver came from: Stoeger or Taylor & Co.
Not sure what causes it. But since it will probably happen regularly, I'm not going to have my cylinder re-blued anytime soon because of this issue.
BTW, on my blued Russian .45 Colt there are some similar markings, not blossoming into the "moon shape;" rather they run only in a thin, straight line at edge of cylinder for each chamber. Interesting.
PT7