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The 300 WSM finally has Peterson brass to match its reputation, and the wait was worth it. This is a bulk 250-count run of unprimed rifle brass built on the same match-grade standard that made Peterson a favorite among long-range hunters and precision handloaders. If you shoot a short-action .30 caliber magnum and want cases that behave the same from the first firing to the tenth, this is the brass to build a load around.
Peterson runs small-batch production lines and keeps every case from a batch together, tagged with a QC number, so the pieces in your box came off the line together and measure alike. Every single case gets 100% dimensionally checked and visually inspected before it ships. Reloaders consistently report weight variance under a grain across full lots, tight neck concentricity, and primer pockets that stay snug through repeated firings. That kind of uniformity is what shrinks your extreme spread and standard deviation, and it shows up on paper at distance.
These cases arrive with Peterson's proprietary EZ-Seat coating, which gives you smooth, uniform bullet and primer seating right out of the box on that first load. They use a large rifle primer pocket and standard flash hole, so no undersized decapping pin needed here. The 300 WSM is a beltless short-action magnum that headspaces off the shoulder, which tends to make case life friendly and sizing straightforward. Popular powders run right in line with the 300 Win Mag, so if you've loaded that round you'll feel at home working up a load.
The 300 WSM was designed to duplicate 300 Win Mag velocities from a shorter, lighter rifle, which makes it a standout for mountain hunts and any setup where you're carrying weight uphill. It's plenty of cartridge for elk, moose, and bear, and it reaches out past 1,000 yards in the right hands. Feed it good brass and it rewards you with the accuracy the platform was built for.
This brass uses a standard large rifle primer pocket and a standard-diameter flash hole. That means you can deprime it with a normal decapping pin and don't need the undersized pin required for Peterson's small-primer offerings. It's a straightforward setup for most 300 WSM load recipes.
The cases ship unprimed with Peterson's EZ-Seat coating, which gives you clean, consistent bullet and primer seating on the first load. As with any new brass, it's good practice to check case length and lightly chamfer the necks before your first loading. Many reloaders find these need very little prep out of the box thanks to Peterson's dimensional inspection.
Case life depends on your load pressure, sizing habits, and rifle, but Peterson brass has a strong reputation for holding primer pockets through many firings. Reloaders regularly report getting numerous reloads out of Peterson cases with proper care. Keeping your loads at or below max pressure and using minimal shoulder bump will stretch that life further.
The 300 WSM closely mimics 300 Win Mag ballistics but does it from a shorter, lighter, beltless case that fits a short-action rifle. That makes it a favorite for backcountry hunters who want magnum performance without the extra weight and length. Powder choices and load development overlap heavily with the 300 Win Mag, so it's an easy transition if you've loaded that round.
| UPC | 810068271348 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40079-P |
| Shipping Weight | 9.8 |
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