First let me start off by saying that I know very little about the construction of the Colt SAA. With that said, I need help with a possible issue. I recently started using my grandfather's Colt SAA that my father gave me. I have put close to 100 rounds through it. The first 40 rounds were Winchester Super X 225gr. lead round nose, with no issues. Then 24 rounds of Magtech Cowboy Action Loads, 250gr. lead flat nose, that's when I started noticing a difference. About 1 out of 6 rounds would throw a lot of smoke and some powder out the sides. My first thought was the ammo, so then I tried 18 rounds of American Eagle 225gr. jacketed soft point. I had better results, only 2 of 18 threw powder. When I went to clean the pistol, I noticed a small indent above the barrel inside the frame. I hadn't noticed it before, but that doesn't mean it wasn't there, like I said I am new to the Colt SAA. Is this normal? or should I be concerned?
I was told it could be powder erosion but it looks too uniform.
Sorry for the horrible pictures.