MTM Ammo Box .50 BMG, 20 rd

• 20-Round Capacity: Holds 20 rounds in a compact format that keeps heavy .50 BMG ammunition organized and easy to transport between storage, bench, and field use.
• Military-Spec Foam Retention: Each cartridge is supported by the base in military-spec foam, helping reduce movement inside the box and keeping rounds separated for cleaner, more orderly storage.
• Water-Resistant O-Ring Seal: The lid uses an O-ring seal to help keep moisture out during normal transport and storage, which is useful for protecting ammunition from damp conditions.
• Stackable, Lockable Design: A stackable body and double padlock tabs make the box easier to store with other gear while adding a practical layer of security.
• Built for Large Cartridges: With a max. OAL of 4.9" and .82” hole diameter, this box is sized for .50 BMG, .416 Barrett, and similar cartridges that need more room than standard rifle ammo boxes.

About the MTM Series

MTM ammunition storage products are built around practical organization for shooters who want durable, straightforward storage rather than oversized cases or improvised containers. Within the brand’s lineup, these boxes cover everything from common handgun and rifle calibers to large-format cartridges, giving reloaders, range shooters, and hunters a consistent system across different ammunition types. The design philosophy is simple: protect each round, keep calibers organized, and make transport easier.

Across the series, MTM boxes are known for their molded polymer construction, caliber-specific layouts, and field-friendly handling. Many models use internal separators or foam support to keep cartridges from shifting, while stackable shapes help make better use of shelf, crate, or bench space. Depending on the model, the range includes slip-top, flip-top, and specialty boxes for unusual cartridge sizes. In practical use, that means the series suits everyone from casual range users to reloaders managing multiple loads and shooters carrying heavier hunting or long-range ammunition. The result is a family of storage boxes focused on orderly storage, transport protection, and efficient access when ammunition needs to stay sorted and ready.

About the MTM Ammo Box .50 BMG, 20 rd

The MTM Ammo Box .50 BMG, 20 rd is purpose-built for shooters using .50 BMG, .416 Barrett, and similar large cartridges that do not fit standard rifle ammo boxes. Its 20-round layout keeps ammunition compact enough for transport while still giving each cartridge its own position, which is especially useful when handling heavy, long rounds at the range or during load development. Instead of letting cartridges knock against one another in bulk storage, the box supports them in an orderly, upright arrangement that makes counting, inspecting, and accessing rounds much easier.

A key part of this model is the military-spec foam base retention, which holds each round by the base rather than relying only on a molded tray. That helps limit movement and keeps large cartridges more stable during transport. The water-resistant O-ring seal adds protection against dust and normal moisture exposure, making the box a sensible choice for vehicle transport, range bags, or shelf storage in changing conditions. MTM also gives the box a stackable body, double padlock tabs, and a carrying handle, so it is easier to store with other ammunition containers and simpler to move when fully loaded. With a maximum overall cartridge length of 4.9" and a .82” hole diameter, this model is tailored to the dimensions and weight of very large rifle cartridges rather than being a compromise fit.

About MTM

MTM Molded Products Company began in 1968 in Dayton, Ohio. The company focuses on products for shooting sports, hunting, and outdoor use, with a range that includes ammunition boxes, ammo cans, firearm cases, and shooting accessories. Over time, MTM also expanded into related categories such as reloading, archery, camping, fishing, and overlanding equipment. The brand remains known for practical molded storage and transport products designed around real field and range use rather than decorative styling. MTM is also family-run and manufactures its products in Dayton, Ohio, which is a notable part of its identity in the shooting accessories market.

Main Features

• Manufacturer: MTM
• Category: Cartridge box
• Capacity: 20 rounds
• Compatible cartridges: .50 BMG, .416 Barrett and similar sized rounds
• Cartridge position: Bullet up
• Maximum OAL: 4.9"
• Hole diameter: .82”
• Seal: Water-resistant O-ring
• Construction features: Stackable design, double padlock tabs, lockable, carrying handle
• Accessory type: Ammunition storage

Warranty

MTM covers this product for 2 years. This warranty period suits a hard-use ammunition storage accessory intended for regular transport, range use, and long-term organization.

In the Box

• MTM Ammo Box .50 BMG, 20 rd