I recently purchased a 29-10 4-inch, shot some full power loads through it cleaned it and noticed burn marks on each of the six cylinder front side about a 1/2 inch back from the front. (looks like I held a torch to the cylinder) I have a 29-2 that I have shot for years no burn marks. Also a 629-6 no burn marks. and a 29-2 Nickle, no burn marks. I Don't like the new Smiths with the key anyway, not as smooth, and no hammer firing point. Anyone else ever experienced the burn marks with the new Smiths. Thanks