>303 Savage

Anyone know anything about this box.
.303 Savage primed cases, U.S.C.CO. headstamp, 50 round U.M.C. box


I’m guessing the box wasn’t sealed when you acquired it.
Someone had an USCCo. box that was falling apart & used the contents to fill an empty UMC box.

I have a USCCo. box ,.38 S&W ,that contains all Peters cartridges.