I shoot my 340PD enough to remain proficient - 25 rounds of +P .38 per month - but otherwise it just rides along. It's a .357 so I've assumed that the use of .38 ammo would have little if any effect on the longevity of the gun but your post has me thinking . . . I wonder if anyone who uses their aluminum framed revolver as I do has experienced wear like that shown in the OPs photos?

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ol' country Jim