Here too, used black for about 23 years and switched to 777 about 6-7 years ago. I notice a slightly longer delay than with the black but I haven't tried the black primer charge yet. Never had an instance when the pan went off that the main didn't. Took my longest deer shot this year with 90gr 3F T7 and a PB 338 Platinum, haven't ranged it yet but I know where 200 is so the shot should range at about 180. MV is 1630fps, I zero at 100 and pattern it at 150, 6" low. Took a big NM bull elk in Sept with this load and am seriously considering using it for an upcoming Newfoundland moose hunt.