Something interesting I picked up today was a full box of USCCo .30-'06 cartridges. Box was nearly completely disintegrated, except for the cardboard separators inside. Attached is a picture of what’s left of the label. Cartridges are headstamped U.S.C.Co 18, and have a full annular crimp around the primers. They are in remarkably good condition otherwise, with just a few of them having corrosion.
A few questions - what would be the meaning of the four different numbers for powder? Possibly multiple propellant lots? Why does the label indicate them to be for aircraft use only? Maybe something to do with synchronization with the propeller, I would guess, but they would certainly work with ground guns. What MG would have used them unlinked? I’d guess the Lewis or Marlin-Rockwell. What sort of box was this originally - one piece or two piece? From the position of the label I would guess one piece, i.e., without having the telescoping lid. I would like to make up a replica box and label for the cartridges if someone can supply information about the box. I can use the existing separators are they are not too bad. The rest of the box is toast. I find the legend about throwing fired cases into soda water humorous - would certainly be fun finding them on the ground after being fired from a plane.