Re: Extinct powders
My experience with the ball powders, especialy WC872. They run very dirty till you approach max pressure, they are temp senstive so if your running it hot enough to run clean, in warm temps you will be overpressure (hot days with max loads will be trouble) so what I do bump the charge up on a day simular to my hunting conditions until it burns clean, now here is where I feel and I could be off but its worked for years, then I bump the powder back down till its just sooty, this gives me a buffer for warmer temps.
I like the ball powders because of the lower flame temps in the big overbore cases it has to increase barrel life.
Born to Hunt, Forced to Work!