Reliant 10126 3-Piece Ammo Box 30 Cal 50 Cal Green Plastic This 3-piece ammo box is ideal for your 30 & 50 cal rounds. All three have a green finish. The 30 cal box has dimensions of 11.50" x 5.25" x 7.25", 50 cal has 13.75" x 7.50" x ", and the 50 cal Fat box has 16.62" x 9.18" x 10.25". NOTE: These boxes do not have dividers.