I've got a carbine class coming up in the fall. I'm bringing 1200 rounds of 5.56 and 500 rounds of .40. I've got 12 pmags and 6 G22 mags that I will preload. The rest of the loose ammo will go into the cans for reloading during the breaks.

What is the preferred can size for 5.56? Is a .30 cal can big enough or should I consider a .50? 100-200 or so could be left out for overnight refill so I'm looking for about 1000 rounds total loose pack. I think a .30 or smaller will do for the handgun ammo.

I will not be keeping loaded mags in the cans.