I know this has been discussed before but I was told to not keep more 22's than you can shoot in 6 months. Not too long ago a friend and I went shooting and he had some old CCI's. He said he bought them about 20 yrs ago and just ran across them in his garage. He had about 400 nrnds. He asked if we should shoot them and I said why not? They ran perfect. Not a misfire. I was impressed.