Both since the early 70's, 7.62x51 match ammo and 30-06 Korean war surplus till I finally shot the 30-06 up 2 years ago. My brother has had 5.56 on clips in cardboard boxes since about 78 and some did get wet and turn green but they wiped off and shot through his mini-14 just fine. I'm still shooting them up trying to get rid of them since we have newer stock in sealed cans. I don't see why you think them being on stripper clips would make a bit of difference to their longevity.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.