No, I've never seen that happen....I have some old reloads - handgun and rifle - and some old factory rifle ammo in my safe for calibers that I haven't shot in years.... .30-40 / old .30-06 200 gr bullets / some really old .38 spl and .357 mag...( where the lead bullets have oxidized a little at this point ) but no cracks in the cases... and some of them are from the 1960's...
I don't know ...
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