I have 2 flinter's. !/2 full on my pans=1/2 of my flash hole covered. I have been told by target shooters that this allows more spark in the flash hole, and gives a minute increase in speed of ignition. And also more reliable ignition. They told me that when you cover the flash hole you can actually retard ignition.

I am no expert, but I watch some experts shoot, and hunt. They fill their pans up to the flash hole with 7F. I shoot silhouette shoots in south eastern PA. And in PA, flinter's are the law. So you see alot of flinter's here. Tom.