MTM CASE-GARD 20-Round Ammo Box RM-20-10

20 cartridges organized, protected, and ready at your belt: The MTM CASE-GARD RM-20-10 is a compact flip-top box for selected medium rifle cartridges. Each cartridge stands individually with the bullet pointing down; two molded ribs keep the bullet tip off the bottom.

Before purchase check


Caliber: The RM-20-10 is designed for .219 Zipper, .22-250 Remington, .220 Russian, .220 Swift, .243 Winchester, .257 Roberts, 6.5×50 mm Japanese, .300 Savage, .303 British, .308 Winchester, .35 Remington, .38-40 Winchester, .38-55 Winchester, .401 Winchester Self Loading, and .44-40 Winchester.

Capacity: 20 cartridges in separate slots. For larger stocks, a 50- or 100-round box is more practical.

Storage: The box protects against dirt and accidental falling out during transport. It is not a lockable security container and does not replace legally required ammunition storage.

Our assessment
The RM-20-10 is especially suitable for the shooting range, hunting, or a clearly separated loading series. The individual slots keep cartridges organized, while the Snap-Lok closure keeps the lid closed. The compact 20-round design fits more easily in a pocket or gear than a large storage box.
Fits well if: You want to transport exactly 20 matching rifle cartridges neatly sorted and quickly accessible.
Not ideal if: Your caliber is not on the confirmed list, you transport loose shotgun shells, or you need lockable long-term storage.

What counts in use


Individual cartridge compartments: prevent cartridges from lying loose and mixed.

Bullet down: makes removal easier at the case base and keeps the labeling clearly visible.

Protective ribs: reduce contact of the bullet tip with the box bottom.

Snap-Lok closure: secures the flip lid during normal transport.

Green version: can be quickly distinguished in gear from differently colored loadings.

User tip: Label each box outside with caliber, bullet, loading, and lot number. This avoids mix-ups without having to check individual cartridges again at the range. Check before closing that all cartridges are fully seated in their slots.

Compatibility and limits
Similarly sized cartridges can also fit too loosely in one box or touch the lid or bottom. Therefore, do not rely solely on the visual similarity of a case. For calibers not explicitly listed, fit should be checked before transport. The box is intended for cartridges, not for cleaning parts, primers, or loose powder.

Technical practical data


Model: RM-20-10

Capacity: 20 rifle cartridges

Design: Flip-top box with Snap-Lok closure and belt attachment

Color: Green

Material: durable plastic

Scope of delivery

1 MTM CASE-GARD RM-20-10 ammunition box for 20 cartridges

Frequently asked questions
Does .308 Winchester fit in the RM-20-10? Yes. .308 Winchester is among the calibers explicitly listed for this model.
Is the box also suitable for .223 Remington? .223 Remington is not listed as a suitable cartridge for the RM-20-10. A correspondingly smaller MTM version should be chosen for that.
Do the bullet tips touch the bottom? The molded protective ribs are designed to keep the bullet tips off the box bottom, provided the cartridge fits the box and is fully inserted.
Can the box be worn on the belt? Yes, the RM-20-10 is designed as a belt and pocket box. The Snap-Lok closure should be fully engaged before movement.
Is the ammunition box lockable? No. It is a transport and organization box with snap closure, not a lockable security container.