Over the years I've tried 777 and pyrodex in both loose form and pellets, as well as Jim Shockey's Gold powder, but not the sticks, in my Knight Disc Extremes. Other than horrible results with the Shockey's Gold, I enjoyed pretty consistent groups with the other powder once I found what my guns liked best. I was never sold on any of the pellets for several reasons. I didn't shoot a lot back then and the pellets would get banged around in my backpack and get old. When weighed at the end of season there was a lot of weight variation. Both of which IMO affect accuracy. All of you preach consistency of load and loading technique as the key to good groups. I agree. When BH 209 first hit the market I tried it and loved its ease of cleanup and performance. For a while, I used the loading tubes from Western Powder to measure my standard 110 Gr load. This spring I bought 100 Lane tubes and a digital powder scale. I now weight all my loads and put bullet, sabot and powder in the tubes with different color caps for the 100 and 110 gr loads of BH209 that I use. It works great and I find that my groups are extremely consistent. The screw on caps keep moisture out of the loads and they make loading follow up shots quick and easy. Easy clean up and no crud rings when using BH209 are added lagniappe. That's a Cajun term for "a little something extra."
My Knights seem to prefer the 110 gr load with 300 gr Harvester PT Gold's and the 100 gr load with their 260gr bullet. I use their Black Crush Rib sabots and standard Winchester 209 Primers for both loads. Loose powder makes load testing much easier than using pellets.