I have reloaded brass from before the first world war and it functions OK.
I have used silfoss to repair cracked neck snider cases and have gained another couple of reloads.
It depends on how rare the cases are and the pressure they are loaded to but if in doubt anneal the necks and check for stretching.
Neck cracking does not seem to be a big deal and a lot of 303 Ex army cracks on the first firing but headspace problems and case stretching is the kiss of death.
For that reason I usually give away cases for free as you do not know how long they will last.
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