yes and no.....
it can deteriate but lots of milserp ammunition going bang that is way more than 50 years old without issue.
how bad/inconsistant is the 30year old stuff??? most probably not bad enough to cause miss or issues under 250 yards I would guess
also ammunition has improved somewhat over time....go back not much more than 30 years and MOST reloaded stuff was better than factory as was more consistant.
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