Description
The 7mm RUM is one of the biggest 7mm cartridges you can feed a rifle, and getting the most out of it starts with quality brass. Peterson Cartridge builds these unprimed cases to a match-grade standard, with consistent wall thickness, uniform case weight, and well-formed flash holes across the lot. For a cartridge that leans on a huge powder charge to push high-BC 7mm bullets past 3,100 fps, that kind of consistency is exactly what keeps your velocities and group sizes honest downrange.
What Makes This 7mm RUM Brass Worth Loading
Peterson runs small-batch production and inspects every casing before it leaves the building, which is why so many precision and long-range handloaders reach for their brass. The flash holes are punched then deburred and chamfered, and the case mouths come chamfered as well, so most reloaders can prime, charge, and seat straight out of the box after a quick inspection. A lot of folks still like to weight-sort and uniform primer pockets for match work, but you're starting from a clean, well-prepped case either way. One thing worth noting from the reloading crowd: Peterson cases tend to run a touch less internal capacity than some other brands, so it's smart to drop your charge and work back up rather than dumping an existing recipe straight in.
Built for the 7mm Remington Ultra Magnum
This is a beltless, rebated, bottleneck case based on the .300 RUM parent, giving the 7mm RUM the largest case of any commercial 7mm. These are large rifle primer pocket cases, which is Peterson's standard setup and plays nice with common dies and most factory rifles without any special tooling. Whether you're building loads for Western big game like elk and mule deer or stretching things out on paper and steel, this brass gives you a durable, reloadable foundation that holds up through multiple firings with proper care. Made in the USA, headstamped 7mm RUM, and ready for load development.
Key Specifications
- Manufacturer: Peterson Cartridge
- Cartridge: 7mm RUM (Remington Ultra Magnum)
- Quantity: 50 per box
- Condition: New, unprimed
- Primer Pocket: Large rifle primer
- Bullet Diameter: .284 in
- Case Type: Beltless, rebated, bottleneck
- Parent Case: .300 Remington Ultra Magnum
- Origin: Made in the USA
- Manufacturer Part Number: 40069-R
- UPC: 810068270518
- Shipping Weight: 2.7 lbs
What’s Included
- 50 unprimed 7mm RUM brass cases
- Peterson plastic storage box
Frequently Asked Questions
Does this Peterson 7mm RUM brass come primed?
No, these cases ship unprimed so you have full control over priming and load development. They use a large rifle primer pocket, which is Peterson's standard configuration and works with common reloading equipment. Just add your choice of large rifle primer when you're ready to build your loads.
How much prep does Peterson 7mm RUM brass need before loading?
Not much. Peterson punches, then deburrs and chamfers the flash holes, and the case mouths come chamfered, so many reloaders load straight from the box after a quick inspection. Some precision shooters still like to weight-sort or uniform the primer pockets for match work, but it isn't required to get consistent results.
Can I use my existing 7mm RUM load data with this brass?
Use it as a reference, but don't dump a max charge straight in. Peterson cases often run slightly less internal capacity than some other brands, which can bump pressure. Drop your charge a bit and work back up while watching for pressure signs to stay safe and dialed in.
What is the 7mm RUM good for?
The 7mm Remington Ultra Magnum is a high-velocity magnum built for reach. It drives high-BC 7mm bullets at impressive speeds, making it a favorite for long-range hunting on elk, mule deer, and other Western big game, as well as long-range target work. Quality brass like this matters a lot when you're running that much powder behind heavy-for-caliber bullets.




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