Cylinder End Play - D.A. revolvers?

[Larryjk]

Rev, I really am sorry to say that I have not had any personal experience with the Colt Python, not having ever owned one. They are really a slick revolver.
I have never watched to see if I could see the lead building up, only feeling the cylinder starting to drag after the lead had built up, opening the cyinder and seeing the drag marks on the face of the cylinder. Then I brushed it off with a stainless brush and went back to shooting. This would occur about every 75 rounds or so using commercial cast 158 gr SWC in the Model 14 S&W. When I was doing that I would buy them either 1 or 2 thousand at a time in a bulk box. Then I switched to a 45 ACP and haven't shot much of the model 14 since then.
The full house loads of LSWC in a .357 Mag and after about 25 rounds having a barrel badly leaded. I switched to gas check cast bullets and you can push the heck out of them without much leading. I don't have much time to do things like cast bullets so I limit myself to reloading my ammunition in the time I have. I have been buying gas check bullets from Leadhead in KS. Good quality bullets and the price is fair.
I find I can shoot most of the bulk, cast bullets up to about 1050 fps without much leading in the barrel.You still get the lead buildup on the frame and cylinder. To go faster than that, get a gas check!