You need to match the primers to the powder in some cases. For instance win 209 or CCI 209 for regular reloading with work fine with Black Horn, with 777 I had the best results with the same 209's in my Triumph but a lot of people have better results with the primers made for muzzle loading [Win 777 and Rem ] Cheddite are very good if you can get them. With Pyrodex I always had best results withMusket caps. Lee