I met a gent recently. He had been shooting cap lock for some time and wanted to know how you avoid or stop flinching, with all that fire in front of your nose. I told him I don't really know I've been doing it so long I don't even see the flash.
So I offered him a chance to shoot my flintlock. Of course he took me up on the offer. We went to the range yesterday, after one shot with my rifle he was hooked.
My rifle is very quick, my first flintlock rifle had the old pause, but this one has absolutely NONE. If there is one it is totally imperceptable, to the point that it is as fast as his cap lock rifle. His words not mine. I'm certain I made a convert to the flint side.
If anything can cause your followthrough to suffer it's the fact that after all that powder goes off, you can't see the target or for that matter the end of your rifle till the smoke clears. But I still never see the flash.