I've had a Dillon 450 since about 1982/3, and can't even begin to estimate how many thousands of CCI large rifle and pistol, and small pistol, mags and standards, I reloaded. Never once, have I had a problem with CCI. And it's quite obvious that my primers were a lot older than four years, too.
Can't answer for anyone else, but that's my experience with Dillon Vs. CCI.
J.B.
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