I'm not the best shot nor do I use the best rest, but here's the last target I shot with my Wolf at 100 yards. The bullet/sabot combo you're using is convenient but I like this combo. A 240 grain .44 cal. XTP in a green Harvester sabot. I was using Pyrodex Select. I don't think the powder you use makes that much difference. Of course, how much you use does.
I find that with the store bought combo you are using, the bullet is just a little bit too short for the sabot and the tip of my ram rod gets stuck at the end of the bullet and the tips of the sabot petals.