This is the Knight Disc .50 caliber shooting Black Horn 209 powder yesterday. Overall pretty good groups.
Today this was the Knight Disc shooting Triple Se7en 2f powder. Again, pretty good groups although the 200 grain XTP were just wild today. Also the 300 grain XTP's normally group better then this, but a storm cloud was coming over so I shot that group and never swabbed the barrel. I was using MMP HPH-24 sabots and other then some crud ring in the bottom (and not really all that bad) they loaded like a dream.
The real surprise of the day were the Shockwaves. I ran out of 300 grain yesterday and thought I had more but [&o] my stock is low. But I did have some 250 grain Shockwaves so I used them. I only loaded 90 grains of powder because I knew that the Shockwaves shot best with that charge. Well I had a good group going. The first two were almost the same hole. Then that third one jumped way out there

but the next two were again back to the original spot. Needless to say, I was pleased.
So overall, Triple Se7en will shoot just as good if not better groups out of that rifle. But take into account, with the BlackHorn 209 I have never tuned the loads like I have with the Triple Se7en 2f. So to be fair, this was not a test of accuracy with the BlackHorn 209.
I am still wondering what I did wrong with them 200 grain XTP's. That kind of bothered me a little.