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The .300 Remington Ultra Magnum is one of the hardest-hitting .30 caliber rounds you can feed a bolt gun, and building ammo that performs at that level starts with good brass. Hornady's unprimed .300 RUM cases give you a clean slate to work from, built to the same standards of precision Hornady brings to the rest of their reloading lineup. These are new, unprimed cases ready for your own primer, powder, and bullet combination.
Hornady runs their brass in smaller lots and holds it to tight tolerances, which pays off where it counts. Uniform case wall thickness is something benchrest crowds have chased for years, and it directly affects how consistently the case behaves under pressure. Tight wall concentricity helps the bullet seat straight in both the case and the chamber, which translates to a cleaner, more uniform release when you touch it off. For a big magnum like the RUM, that kind of consistency matters when you're reaching way out there.
Consistent case weight and internal capacity mean your charges and pressures stay repeatable from one case to the next, which is the whole point of rolling your own. Because Hornady puts the extra care in up front, these cases tend to hold up well through multiple firings and resizings, so you get more useful life out of every piece. Just remember these ship unprimed and empty, so you'll need to work them up with your preferred load data before heading to the range.
Whether you're loading for a long-range hunting rig or just want full control over your .300 RUM ammo, this is solid, dependable brass to build on. It's made in the USA and carries the headstamp of a company that treats brass as the foundation of an accurate cartridge rather than an afterthought.
These are new, unprimed cases. You'll add your own primer, powder, and bullet when working up a load. That gives you full control over the components that go into your .300 Ultra Magnum ammo.
Each box contains 20 unprimed brass cases. That's a common count for magnum rifle brass and makes it easy to keep track of load development in batches.
Yes. Hornady produces this brass in smaller lots with tight tolerances and consistent wall thickness, which tends to hold up well through repeated firings and resizings. Proper sizing, trimming, and annealing as needed will help you get the most life out of each case.
This is standard SAAMI-spec .300 RUM brass, so it's built to fit any firearm chambered for the cartridge. As always, inspect and resize your cases to match your chamber before loading, and double-check case length against published trim specs.
| UPC | 090255867244 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 86724 |
| Caliber/Gauge | .300 RUM |
| Product Type | Rifle |
| Quantity | 20 |
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