Description
The .338 Marlin Express is one of those cartridges that rewards a reloader who likes to tinker, and finding factory ammo for it has gotten tougher over the years. That makes a fresh box of Hornady unprimed brass a smart thing to keep on the bench. These are new, unprimed cases ready for your own load development, whether you're chasing a flat-shooting deer load or just topping off your stash for your lever gun.
Hornady builds this brass to the same standard as the cases behind their loaded ammo. Each case is measured for tight wall concentricity, which helps the bullet seat straight in both the case and the chamber for a more uniform release on firing. You also get consistent wall thickness and matched weight and capacity across the box, and that uniformity is what translates into steadier pressures and tighter groups down range.
What Makes This .338 Marlin Express Brass Worth It
The .338 Marlin Express was designed to roughly duplicate .30-06 energy in a round that feeds through a tubular-magazine lever action, so you're working with a semi-rimmed, bottleneck case that takes a large rifle primer. Quality brass matters even more here because supply has dried up since the cartridge was discontinued. Taking care of these cases and getting several reloads out of each one stretches your ammo supply a long way.
Prepping Your Hornady 338 MX Cases
As with any new rifle brass, give these a quick once-over before loading. Run each case through your sizing die to true up the mouth, then chamfer and deburr inside and out, and lube the neck so it doesn't stretch. A little prep up front sets you up for clean seating and consistent results. From there it's just picking your powder, primer, and bullet and getting to work on a load your rifle likes.
Key Specifications
- Manufacturer: Hornady
- Manufacturer Part Number: 8721
- UPC: 090255487213
- Cartridge: .338 Marlin Express
- Case Material: Brass
- Condition: New, Unprimed
- Primer Size: Large Rifle
- Quantity: 50 Per Box
- Case Type: Semi-Rimmed, Bottleneck
- Country of Origin: United States
What’s Included
- 50 new unprimed .338 Marlin Express brass cases
Frequently Asked Questions
Is this 338 Marlin Express brass primed or ready to shoot?
No, these are new unprimed cases and not loaded ammunition. They're a reloading component, so you'll add your own primer, powder, and bullet. They take a large rifle primer.
What primer size does the .338 Marlin Express use?
The .338 Marlin Express uses a large rifle primer. It's a semi-rimmed, bottleneck case based on the .376 Steyr, designed to feed through tubular-magazine lever-action rifles.
Do I need to prep these Hornady cases before loading?
A little prep goes a long way with any new rifle brass. Run each case through your sizing die to straighten the mouth, then chamfer and deburr inside and out, and lube the neck to keep it from stretching. After that they're ready for your load workup.
Why buy brass for a discontinued cartridge like the 338 MX?
The .338 Marlin Express was produced from 2009 to 2019, so factory ammo and components have gotten scarce. Reloading your own lets you keep feeding your lever gun, and quality Hornady brass holds up for multiple firings when you take care of it.




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