The MTM Case-Gard J-20 Series Slip-Top Rifle Ammo Box (J20-MLD-29) provides secure, rattle-free storage for 20 rounds of short-action magnum, large-calibre rimmed, and fat-bodied rifle ammunition. Constructed from high-impact polypropylene in a translucent Clear Red finish, it allows shooters and reloaders to inspect primer seating, bullet profiles, and remaining capacity without opening the case. The friction-fit slip-top lid eliminates mechanical latches and living hinges that can fatigue over time, making it a dependable, compact ammunition carrier for the field or loading bench.

Key Features:

• Friction-Fit Slip-Top Design: Utilises a durable two-piece sliding lid with no mechanical hinges or latches to wear out.
• Chemical-Resistant Polypropylene: Resists cracking, warping, chipping, expanding, and contracting across ambient temperature ranges from -20°C to +60°C.
• Visual Inspection: Clear Red translucent plastic enables quick verification of cartridge counts and primer conditions while keeping ammunition protected.
• Included Load Labels: Comes with factory load label stickers for recording load data, powder charges, and ballistic notes.

Specifications:

• Cartridge Capacity: 20 rounds
• Maximum Overall Cartridge Length (Max OAL): 3.05 inches (77.5 mm) bullet-up
• Exterior Dimensions: 155 mm × 89 mm × 40 mm (6.1 in × 3.5 in × 1.6 in)
• Empty Weight: 90–100 grams
• Calibre Compatibility: .300 / .270 / 7mm / .325 / .338 Winchester Short Magnum (WSM); .300 / 6.5mm Remington Short Action Ultra Mag (SAUM); .300 / .338 / .375 Ruger Compact Magnum (RCM); .45-70 Government, .40-65 Win, .444 Marlin, .458 SOCOM, .450 Bushmaster, .348 Win, and 2.5-inch .410 shotshells

Who is the MTM Case-Gard J-20 Series Slip-Top Rifle Ammo Box for?

• Hunters carrying .45-70 Government rifles in remote terrain — needs a compact slip-top ammo box with a 155 mm × 89 mm × 40 mm exterior footprint that fits into jacket pockets or day packs while carrying 20 rounds of large-bore ammunition securely.
• Reloaders organising WSM and SAUM handloads — requires a dedicated 20-round rifle ammo box that accommodates fat-bodied magnum cases with a maximum overall cartridge length of up to 3.05 inches (77.5 mm).
• Stalkers using pocket-carried ammunition in day packs — benefits from a lightweight slip-top ammo box weighing just 90–100 grams empty, eliminating excess pack weight on long mobile hunts.

Less suitable for: Cartridges exceeding the 3.05-inch (77.5 mm) maximum overall length limit (such as standard full-length magnums), which require an extra-long rifle ammo box, or high-volume range shooters requiring a storage capacity greater than 20 rounds, who are better served by a 50- or 100-round hinged ammunition case.