I've never had issues with old ammo use it all the time ...only case I heard of was a guy at one of our clubs where im from shooting .45 auto loads from WW2, had two hang fires in a row, did the usal keep the gun aimed down range count to ten take it out sat the rounds on the bench to get rid of later, and then they closed the range to go check thier targets ...well didnt one of those old rounds go off while they were down there pretty much messed thier britchs..it had sat there for at least 20 mins. freaky!