I finished putting my ammo in clips and filling the cans yesterday. I switched the contents of 2 of them and labelled them today. I decided to write on them with a paint pen. It's easy enough to edit without sanding down and repainting the cans.
The .30 cal cans are filled with .45 ACP ball ammo, ~2,000 rounds of .22 LR, and 5.56mm/.223 Rem. tracers and blanks. I have 30 blanks in clips in some of the boxes that used to have Israeli-made M193 ball ammo. It almost fits right and I have little piece of Scotch tape holding them shut. I flattened all of my empty boxes and threw them in the trash before I found another 18 blanks in clips, so I stuck them in a Ziploc bag with a plastic divider between them.
The .50 cal cans are filled with 900 rounds of M193 ball, 900 rounds of .223 50 gr. JHPs, Mil-Spec and PMC X-TAC M855 ball, plus 2 boxes of 62 gr. FMJs, and a variety of .223 Rem. and 5.56mm 55 gr. FMJ ammo, mostly PMC Bronze .223. The 5.56mm is in boxes so I don't get it mixed up with the .223. When I use some 5.56mm M193 ball from another can I can use that to top it off. The black can isn't labelled because it isn't all one thing.
I stacked the cans on the bedroom floor where I used to have empty clothes baskets setting. After I took all the pics, I decided I didn't like how the 2 .30 cal cans in a stack were leaning. So I took a .50 cal can off the stack and have 2 .30 cal cans on top of .50 cal cans, and one on the floor by itself. Everything looks nice and stable now.