Haven't done it for a long time now, but when I did I filled a pan with water up to the shoulders of
a bunch of brass standing up in the water. Got em all hot with a torch and tipped them all over.
Seemed to work as I remember.
Since then I got rid of, or don't shoot that often, any guns that were/are hard on brass.

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".