How old is your Pyrodex? I shot some last year that seemed to have issues. Mine was 6+yrs old. I have heard it does not store well. It worked fine on my 25yrd shot on a doe with a homecast bullet. I shot my Knight Disc this week. I am very happy with my new setup of Hornaday SST 250 grn sabots over 100grns of the new Blackhorn 209 powder. I used both the 'low drag' & regular sabots. With the 209 the regular sabots were fine.