No, I don't and it is always very accurate out to 50 yards, I can't really use sights beyond that. I try to avoid fillers whenever possible, best to keep things simple. I may try kapok sometime, but I doubt I would get any better results at the short distances I shoot this rifle. From what I can tell, the fast to medium burning pistol/shotgun powders ignite easily and are alot less likely to need fillers than actual rifle powders. I have no interest in using rifle powders in .45-70. I don't need any higher power level, the recoil level goes up, and large powder charges are not cheap.