If you' re using a non-magnum plastic sabot, don' t buy the FFF.

If you' re shooting a side-hammer, it will enhance ignition. Also in side-hammers, FFF 777 will seize-shut your cleanout screw & nipple unless you are checking/mechanically freeing them after every 3-4 shots.

I just re-ordered (4) cleanout (bolster) screws from Traditions.com... I keep forgetting to check them & have rounded-out the screwdriver fittings a couple of times already.