Duckbutter48,

I use the Lyman flash hole deburring tool. It makes them uniform and cleans up the inside burr from being punched. I just chuck it up in a cordless and very slowly clean the hole. It is just basically a #1 center drill pressed in a stell shaft with a tapered cone for centering. The RCBS wire brushes are ok. By the way I grew up in Cumberland, MD. Left in 1980 when I joined the military.