The MTM Case-Gard 50 Round Rifle Ammunition Box (RS-50) is a popular and durable plastic storage solution designed specifically for .223 Remington, .222 Remington, .204 Ruger, and similar cartridges. 
 
Key Features and Specifications
Capacity: Holds 50 rounds of rifle ammunition.
Material: Made of virtually indestructible polypropylene that will not warp, crack, or chip.
Closure: Features a reliable Snap-Lok latch to prevent accidental spills and a full-length mechanical hinge that is guaranteed for 25 years.
Design: The boxes are stackable for efficient storage and have an easy-to-grip textured surface.
Organization: A load label is included with each box for recording load and sight data.
Compatibility: The RS-50 model is compatible with the following calibers, with a maximum overall length (OAL) of 2.65":
.17 Fireball
.17 / .221 / .223 Rem.
.204 Ruger
.222 Rem. Mag.
.300 Sherwood
.300 Whisper
6mm-223 Rem.
6 x 47