Brass, bullets, hulls and wads
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Brass cases
Sorted by calibre first, then by headstamp because different makers have different case capacities, then by how many times they have been fired, because brass work hardens and eventually splits.
Which is four sorts for one calibre
A single cartridge can occupy half a dozen containers on a serious bench. The container count is driven by the sorting, not by the volume.
And brass is heavy
A jar fills by weight long before it fills by volume. A large container full of .308 brass is a container that cracks when dropped and strains the shelf it sits on.
So smaller jars than instinct suggests
116 containers at 120 mL or under on this shelf. For brass and bullets that is the useful range even though the parts are not tiny.
Cast and jacketed bullets
By grain weight and by diameter in thousandths. Cast bullets carry a lubricant that migrates in heat, so they want to be kept cool and separate from anything the lube could reach.
Gas checks
Small copper cups, tiny and light, and they vanish in a container sized for brass. 25 containers at 30 mL or under is the relevant set.
Hulls and wads are the bulky exception
Shotgun hulls by gauge and type, wads by height. These want the large end of the shelf and the 12 tubs and pails are the nearest fit.
Everything metal here corrodes
Brass tarnishes, steel components rust, and a garage or a basement is damp. 9 liners and sealing discs on this shelf are the line item that addresses it.
Label in numbers, on the body
Calibre, grain, diameter, firing count. Lids get swapped and a colour code fails for around one in twelve men, so numbers in words are the label.
And keep the lube and solvent away from the components
Case lube on a bullet is a bullet that seats wrong, and bore solvent is aggressive. Different part of the bench, ideally a different tray.