Then I have no idea what to tell you. I never had a problem with BlackHorn going off when I shot Winchester W209. I guess change primers and try a different one.

According to the information Black Horn sent me, Winchester, CCI, Federal, Cheddite, and Remington are good brands. Stay away from Remington Kleenbore, Winchester Triple Se7en, musket caps, #11 caps, CCI inline MZL primers, and Federal Fusion 209 Muzzleloading primers.