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Peterson Cartridge built its name on making some of the most consistent large-magnum brass a reloader can put on the bench, and the 300 RUM offering is a great example of that reputation. The .300 Remington Ultra Magnum is a beltless, high-capacity case based on the .404 Jeffery, and it runs a big charge of powder to push heavy .30 caliber bullets at serious velocity. That kind of pressure and case capacity demands brass that stays uniform and durable, and this is where Peterson earns its keep.
Every case starts as C260 cartridge brass and goes through a long list of forming, tapering, and trimming steps with annealing worked in along the way. The mouth and neck get induction annealed, which controls temperature to the degree and helps the case grip the bullet consistently and release it the same way shot after shot. Flash holes are punched to be centered and burr-free, and the primer pockets are formed with the kind of tight tolerance that keeps them snug through multiple firings. Peterson runs both automated and hand inspection so the goal is every casing meeting spec before it ships.
These come to you unprimed and ready for full case prep. Reloaders who run this brass regularly report tight case-to-case weight variance, clean necks, and primer pockets that stay tight across many reloads, which is exactly what you want out of a magnum case that sees high pressure. The heavier, well-annealed construction is a big reason folks coming off Lapua or other premium brass tend to stick with it. For a caliber that thrives on big powder charges and heavy bullets for extreme long-range and big-game work, starting with uniform brass takes a lot of the guesswork out of load development.
Bottom line, if you shoot the 300 RUM and you handload, this is brass worth building your loads around. Prep it, load it, and it will reward you with the kind of consistency that shows up on the target.
These cases ship unprimed and unloaded, so they are ready for your full reloading process. You will need to prime, charge, and seat bullets before use. This is component brass, not loaded ammunition.
Peterson designs its brass to get more reloads per casing than the industry average, and reloaders regularly report primer pockets staying tight and necks holding up across many firings. Actual case life depends on your load pressure, sizing practices, and how well you care for the brass. With proper prep and moderate loads, this brass is known for going the distance.
The 300 RUM brass uses a standard Large Rifle primer pocket with the traditional flash hole. That makes load development straightforward with common Large Rifle primers. Always confirm your pocket and flash hole size before running an undersized decapping pin.
As with any new match-grade brass, it is smart to check overall length, chamfer and deburr necks, and uniform primer pockets before your first firing. Peterson cases run consistent out of the box, but a quick pass of case prep helps you get the most uniform results. Many reloaders find these need little more than a light touch to be range ready.
| UPC | 810068270501 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40070-R |
| Caliber/Gauge | .300 RUM |
| Length | 7.1000 |
| Shipping Weight | 2.7 |
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