I shoot a Black Diamond XR. 100 grains of Triple Seven 2f is a good load. This is what I use and have good results.
Try swabbing the bore with Windex, not a dry patch. Lightly dampen the patch and work that barrel in short strokes. Triple Seven does leave a fouling. And a dry patch is only going to push it around. There is no need to use solvent to swab the bore on the range. After the damp patch, then run two dry patches.
This is my BD shooting 100 grains of T-7 and some 250 grain Shockwaves in the supplied sabots. This is 50 yards of course with a 4.5x32mm scope.
This is the BD shoot 120 grains of Pyrodex RS and 250 grain XTP's in black harvester crushed rib sabots. Again only 60 yards but I was working loads that week.
Swab well, let the barrel cool, and try changing to the green harvester crushed rib sabots. Also when I shoot .44 caliber stuff I like heavier bullets like the 300 grain. But you have a free floating barrel and one of the best shooting rifles made.