I have around 250 .45-70Govt cases that refuse to wear out with the low loads I shoot.
Lapua brass for the .308s and 6.5, and Grafs for the 7.5s. 7mm stuff is RWS from the late 80's that is still going strong.
My 1000 nickel .357Mag cases, bought in 1996, occasionally get frilly at the top, but again, because they are not over-worked in reloading, seem to be going of forever.
tac