Will my .300 Win Mag cartridges fit securely in the MTM J20-LLD-29 slip-top box without excessive rattling?

Yes, this model is specifically engineered for large magnum cartridges up to a maximum overall length of 3.84 inches. Standard .300 Win Mag and similar big-game rounds sit snugly in the bullet-up position. However, if you attempt to use much shorter cartridges under approximately 2.8 inches, you will experience excessive vertical rattle.

Is the slip-top friction-fit lid reliable during rugged bush walks and outback hunting trips?

The two-piece slip-top design relies on a durable friction-fit polypropylene structure with no mechanical hinges or latches that could snap in cold weather or dense brush. Its slim, pocket-sized profile fits easily into a jacket pocket or daypack for quick access during a stalk. Note that while it handles outback dust and field moisture well, it does not feature an O-ring seal and is not waterproof for submersion.

How does this ammo box assist with Australian firearm storage regulations?

While state and territory laws in Australia require ammunition to be locked securely in an approved container or safe separate from your firearm, this 20-round box provides ideal internal organization. It is great for separating your handloaded batches or factory hunting rounds inside your safe, as well as keeping them protected during transit to the shooting range.

Magnum Ammo Box - MTM Case-Gard J20-LLD-29

The MTM Case-Gard J-20 Series Slip-Top Rifle Ammo Box (Extra Large Magnum Size) provides compact, secure transport for up to 20 large magnum rifle cartridges. Engineered with a durable polypropylene polymer body in clear red, this two-piece container features a smooth friction-fit sliding lid that eliminates mechanical latches or hinges. It is sized to accommodate cartridges positioned bullet-up with a maximum overall cartridge length (OAL) of 3.84 inches (97.5 mm), offering protection against impact and moisture during field carry, range sessions, or organized storage inside an Australian-compliant ammunition safe.

Key Features

Friction-Fit Slip-Top: Two-piece sliding lid design opens and closes smoothly without mechanical hinges or latches that can snap.
Compact Profile: Slim, pocket-sized footprint fits into jacket pockets, daypacks, and range bags without the bulk or rattle of factory packaging.
Polypropylene Polymer: Weather-resistant material designed not to warp, crack, chip, peel, expand, or contract under standard storage conditions.
Visual Load Inspection: Transparent red material allows quick identification of headstamps, primers, and bullet profiles while organizing specific batches.

Product Specifications

Cartridge Capacity: 20 rounds
Maximum Cartridge Overall Length (OAL): 3.84 inches (97.5 mm)
Material: Polypropylene polymer
Colour: Clear Red
Compatible Calibres: Accommodates large magnum cartridges including 7mm Remington Magnum, .300 Win Mag, .338 Win Mag, .458 Win Mag, Remington Ultra Mags (.300, .338, .375, 7mm RUM), Weatherby Magnums (.257, .270, .300, .340, .375, 7mm, .338-378, 6.5-300 Wby Mag), .300/.375 H&H Magnum, .300 PRC, 7mm PRC, 26/28/30/33 Nosler, .303 British, 7.62x54R, 9.3x62, and .458 Lott.

Who is the MTM Slip-Top Rifle Ammo Box - 20 Round For Rem Mags, Wby Mags, Win Mags - Clear Red for?

Big-game and stalk hunters carrying magnum calibres in the field — provides a pocket-sized 20-round magnum rifle ammo box designed to protect cartridges up to 3.84 inches (97.5 mm) in overall length from field impacts without the noise of loose factory boxes.
Target shooters conducting batch load development — features a clear red 20-round capacity layout that allows visual inspection of seating depths and primer types for long-action handloads up to 3.84 inches overall length.

Less suitable for: Standard short-action calibres with an overall length under approximately 2.8 inches (such as .308 Win or .243 Win), which exhibit excessive vertical rattle and are better matched to dedicated compact-cartridge slip-top ammo boxes, or extra-long custom cartridges exceeding the 3.84-inch overall length ceiling that prevent the sliding lid from seating properly.

SKU	MM41138LP
Model #	J20-LLD-29
Brand	Mtm Case-Gard
Shipping Weight	1.0000kg

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Mtm Case-Gard J20-Lld-29 Ammo Box 20 Round Magnum Clear Red

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