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I wouldn't worry about it. Eventually the area hardens up and the flame cutting stops. My S&W 27 has some deep cuting from a steady diet of hot loads but I'm not concerned after a bit of research on the matter.
HOWDY; Looks like a Ruger 357 mag I pounded the piss out of for years . Shot pounds of winchester 296 and 200 grain bullets. No big deal carry on I would and did .