TIL I learnt that special ammo boxes are not only color-coded, but

Original U.S. WWII Browning M1917A1 Display Machine Gun With Tripod and Ammo Box – International Military Antiques

223/5.56 Ammo Container 50 Round

The Ammo Can Gift no Liquor Included

223/5.56 Ammo Container 50 Round

Ammo Box Nickel Brass Bullet Gift Set – ManCrafted

MTM 100 Round Rifle Ammo Box 17, 204, 223, 5.56x45, 6x47, Clear Blue : Sports & Outdoors

224 Valkyrie Will Get a 100gr Bullet - Federal Premium Releases Official Data and Loads -The Firearm Blog

treeline Metal Ammo Can, Army Green at Tractor Supply Co.

Machir Deluxe Quick Access Steel Safe with Digital Color Coded Keypad and Solid Steel Construction