BIGPETE , i have been shooting a T/C .36 Seneca for about 3 years and have no problem with accuracy ! Thing i noticed first , was your powder charge , about double what it should be . Next , was your choice (2F) , try some 3F in a small caliber. In all truth i have switched to "TripleF , 3F sub powder in my .32 , .36 , and .45 cal rifles !! And no , i have nothing against "black" , except in my area there is hardly ANY supply support for muzzle loader shooters, at the top of Maine . Don't know how much this may affect accuracy , but , do you shoot your home spun round-balls with the sprue sticking out ??? When i cast , no matter the caliber , i have an old file clamped in my vise to drag the sprue over to remove it . May not help accuracy , but sure does not hurt it ! Hope this helped !