Late 70's while shooting for my Pistol "E" Qual, we used some loaded back in the late 40's and early 50's for practice before using some normal storebought stuff. Military .45 ACP ball, some of it didn't shoot so good....kinda went "phoooof"...bullet landed about 10 yards downrange, thankfully enough pressure to not cause a squib...
Just a month or so back, I shot up some leftover .22 LR from the early 80's... no problems...