I didn't realize how fortunate I was, as I have tons of it. Back in the day, like 25 or so yrs. ago, a friend of mine who didn't reload would give me all his brass, including over a thousand pieces of 6mm brass, and only maybe 300 pieces have been loaded yet, and probably only 3 or 4 times. And considering I keep it sealed in air tight containers, and store it with those little oxygen inhibitors in with it, it will probably last me for another 25 yrs..
GS2