I shoot my own reloads primarily - but there is a difference, if I change powder or primers in my loads, in how dirty my guns are. I think what you are seeing is an ammunition issue. But there are powders that burn cleaner in some calibers than in other calibers (more complete burn, less smoke, etc.) and even though in theory small pistol primers are all alike, I do see a difference if I use Winchester vs CCI vs Remington ......so I have a tendancy to stay with one powder Hodgdon Titegroup in my handguns and CCI primers.