My understanding is that the AccuSporter is able to shoot pellets but a word of advise.. after the pellets are gone, I would not replace them. Also for the time being, duplex your loads. With a powder measure, measure out about 20 grains of Black Powder in 2 or 3f If you have 4f as a primer then measure out 10 grains. Then slide the pellets in on top of that. What will happen is the loose powder will catch the spark from the frizzen and explode that under the pellet which will provide the fire necessary to set them off.

You will find a quicker ignition with pure black powder. And forget the pellets. For sabots, try some XTP in 300 grain, 250 grain Shockwaves, 250 or 300 grain Nosler, or one of the better quality sabot/bullet combinations out there. You should get excellent results...

Keep us posted as to how your rifle shoots. Some Thomas Fuller Black Powder Flints will work well in that rifle too.. I believe your hammer is a 5/8th but a 3/4 will also work. Measure your frizzen and the width of it will tell you the flint you need...