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Belted magnums have a reputation among reloaders, and not always a good one. The 7mm Rem Mag headspaces off that belt, so fresh brass tends to stretch a good bit on the first firing, thinning the case just ahead of the belt over time. Peterson's answer is this "Long" version, which carries extra base-to-shoulder length so you can size the shoulder back to match your chamber before you ever pull the trigger. That small step up front means less stretch, better case life, and brass that behaves more like the premium stuff you'd expect in a bolt gun.
Peterson built its name on match-grade brass, and this belted magnum offering carries the same DNA. The company came into the 7mm Rem Mag after refining its .300 Win Mag line, applying what it learned about belted cases to get the wall thickness, primer pockets, and flash holes tight and repeatable. Reloaders who chase low extreme spread and single-digit standard deviation gravitate toward this brass because the case-to-case uniformity does a lot of the work for you.
This is a component for the handloader, whether you're building hunting loads for elk, mule deer, and bear or working up a precision recipe for the range. The 7mm Rem Mag has stayed a top-selling magnum since 1962 for good reason, delivering flat trajectories and honest downrange energy. Feedback from the reloading community leans hard in Peterson's favor, with folks reporting very few culls out of a box and consistent measurements once trimmed and prepped.
Keep in mind this is unprimed brass, so you'll supply your own primers, powder, and bullets. Because it's the Long version, plan on setting your sizing die to bump the shoulder back to your rifle's headspace before the first firing to get the full benefit. Treat it right and this brass will reward you with more trips through the press than typical factory cases.
The Long version has extra base-to-shoulder length compared to standard belted magnum brass. That lets you bump the shoulder back to match your chamber before the first firing, which reduces the heavy case stretch belted magnums are known for. The payoff is longer brass life and less thinning ahead of the belt over repeated loadings.
It comes unprimed, so it's a true reloading component. You'll add your own large rifle primers, powder, and bullets. Most handloaders will also want to size, trim, and prep before loading, and with the Long version that includes setting shoulder bump before the first firing.
Peterson designs its brass to get more reloads per case than the industry average, and the Long design helps stretch that further by limiting first-fire stretch. Actual case life depends on your load pressure, sizing practices, and how carefully you prep. Keep an eye on the area just ahead of the belt over time, since that's the spot to watch on any belted magnum.
The 7mm Rem Mag is a proven big game round, so this brass works great for building hunting loads for deer, elk, and bear. It's equally at home in a precision or long-range setup where consistent case volume and tight tolerances matter. The versatility is a big reason the cartridge has stayed popular for over six decades.
| UPC | 810068270730 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40071-R |
| Shipping Weight | 2.3 |
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