Re: Steel wool brass prep
When i welded ss pipe with stick i would see light surface rust, or flash rust. When we mig or tig machined parts we never had a problem. I always chalked it up to some sort of porosity or contamination. Never even considered the wire brush. Lets stop hi jacking this thread.
I habitually use steel wool to polish casings and smooth out edges of the mouth to prevent damage to the bullet when seating.
I think this works well and is partly why the ss tumbling media is catching on the way it is.