Assume it’s corrosive primed, non corrosive powder from that era. Many people told me that no 30 carbine was corrosive, but why risk a nice piece? I have some Korean era ammo too-great stuff, reliable, consistent, full power,etc. Good ammo, just clean well when done (even hot soapy water works in a pinch for corrosive ammo, or any commercial cleaner,Hoppes, Shooters choice,etc.). Dry well, and oil well. If you reload, soak the brass in soapy water afterward, and rinse well. Or the corrosion eats the brass around the head of the cartridge, and weakens it for reloading. Had a head separation with 30-06 once when i was younger-only takes once to learn that!
Thnx!
Good advice is to clean your pieces after every time out anyways!