I posted this in error yesterday in the Mil.Surp section.
I have been using WC872 now for a year or so....in 308, 7.62x54R and 303 Brit. I have been using a kicker of either Red Dot, or IMR4227 or Unique with the balance of a compressed load of WC872. This works very well, leaves NO unburned granules and is also VERY accurate with a Lee Cast boolit (185gr) at 100yds. I tried several variations of kicker but finally settled at 7gr as best. I still have 47lbs of WC872 to burn through yet! Thanks to all those who went before me and posted results. It has helped me immensely.
Just remember that any smokeless duplex loads MUST be compressed loads. I am so glad that this has worked out for me. It gives me fast, clean and very accurate RIFLE loads at around 5 cents each for powder! Amazing!