I have no experience with this but my guess is no. Apparently the copper removal comes from a trace of lead in the powder. As the powder is ignited and goes down the barrel, it takes out the copper. I wouldn't think it would do any harm to the brass.
Perhaps this is a nuance, but I understand that the powder doesn't remove copper fouling, its use leads to less copper fouling being deposited.
Is anyone using it and liking this powder?
The newest powder I use is XBR 8208 which I started loading 223 a few years ago.
I think 8208 is great in 223, as is BLC2 and Varget, but I would not mind trying one of these new powders if someone gives me a push.



























