Well I have read an old article where they tried 2F vs 3F and "elevated" the muskets as is often done when lines get close. They found in both cases the elevation actually succeeded in tossing hot ash farther, and far enough to possibly reach the guys in the other line, and that 2F got better results in tossing the hot ash. So..., IF the powder was a tiny bit damp, then you could get some clumping and toss a lit ember. The conclusion was that keeping the muskets level caused the ash to fall short..., but the lads don't like doing that when folks are getting close.
You actually have more problems with the guy on your left getting you with his flash from his touch hole when his flash guard is loose and dropped down on the lock, or by somebody double loading, than from the opposing volley.
2F at 100 grains from a .69 to .75 caliber musket will give you a FOOOMPF sound.....3F will give you a nice pop. Neither is as loud as when you ram down a cartridge paper on top, let alone when you live fire. So..., when you ever get the chance to shoot 2F and a ball, don't forget the ear plugs :wink:
LD