I was talking with some "older" (I'm 62) gentlemen at the last local gunshow... they mentioned that in the late 1960's - early 1970's that they noticed a change in Winchester / Western brass. The new formula brass could only be reloaded 5-6 times before failure... previously they had gotten 12-15. Has anyone else ever heard of this before? Is it the brass or possibly the result of powder changes? I reload, but not one box at a time, which is what these guys were talking about.