I load 2 grains in my t/c pan flinter and when possiable always tap the charge to the right away from the vent liner:I would say the more powder in the flinter pan the longer the delay to set the main charge off.
I load 95 grains of goex 3Fa hornady 230 Gr. ball over a wad patched RB in mt 54 cal. renegade flinter