I have a custom cartridge that I developed. I built it around 12 ga brass hulls and a 720 grn 12 gauge Paradox bullet. The bullet is .715 in dia. Some hulls use 209 primers, some use large pistol primers. My load of choice is 90 grains of BH 209, an over powder card, a split fiber wad, the bullet and then another over powder wad that is crimped down using a custom crimper. Well, the 209 primed cases work great. Big boom, bullet shoots tight out of my H&R Magnum slug gun. 4" at 100 yards is very repeatable. However, the cases primed with Win magnum large pistol primers hang fire every time. So, moral of the story, BH209 required a hot primer and a direct flame. If you have ever looked at the inside of a brass 12 gauge case, you know that the primer pocket extends up into the case like an inverse percussion nipple. This indirect path makes for slow ignition. Cases primed with 209 primers have a flat base interior so that the flame from the primer shoots right into the base of the powder charge making ignition much faster.
So, no more BH 209 in pistol primed cases.