Backing out the firing pin bushing is really the best option but then its primer specific. You dont want to slam it shut on a Fed209A after you have set the bushing for a Cheddite. You could set off the primer doing that.
You can back out the pin bushing to being flush with the frame....Insert a live primer and close the action....Get out a set of feeler gauges and see how much room is between the primer and bushing,
Oh and ive heard Walmart has Federal 209MZ primers for about $8 now. Even though they are a ML primer its the same primer they recommend for the FireStick.....>Guess whats in a Firestick?.......Blackhorn209 but Hodgdon is calling it Triple8.

Someone called Federal and the CS person told them its actually CCI209M primer. They just changed the color and charged your butt more for it.
You can use this to check to see if any Walmart near you has them in stock