If bigger flash holes were better, don't you think after all these years, ammo manufacturers would have figured that out? I've never once had to drill out a flash hole. Ran into some rough burred ones and my torch tip cleaner fixes that right up. That's what I use to poke the stuck media out with and while I'm at it, also remove burrs. 2 birds with 1 stone. Nothing too complicated there.
On top of that it appears that the best made brass for cartridges used in the most precise competition disciplines often has deliberately small flash holes.
