I use the 10x10 plastic boxes and do color code them. My .45 Colt are red. My .45ACP are red (but they are different size), Green for .44Mag, Blue for .44Spec. .357 I don't care as they are smaller boxes. Don't shoot .38s (if I did, I'd color code them too). All boxes are labeled on top of course to what is in them, but color does make it easy to pull a box from the cabinet.
I don't shoot enough rifle to matter. Only have one case of 30-30 and a few boxes of '06....
A clinger. When guns are outlawed, only outlaws will have guns. Single Action .45 Colt (Sometimes improperly referred to by its alias as the .45 'Long' Colt or .45LC). Don't leave home without it. Ok.... the .44Spec is growing on me ... but the .45 Colt is still king.