I agree with Paul B. The sizing lubricant really cruds up a gun quickly, especially stainless steel. Be sure to clean your gun after each range session. Pay close attention to ejector rod and cylinder bore. The fit there is tight and I've had problems with burned lubricant getting in there and gumming up an otherwise smooth action.
As for clean burning powders my experience is Bullseye, W231, and PowerPistol are all very clean burning.
Check the Blue Press from a couple of months ago, I believe they had an article on this subject.
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