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Peterson spent over three years and a serious pile of money getting their belted magnum case right, and this .300 Win Mag brass is the result. Made in Pittsburgh, Pennsylvania on a dedicated case line, it carries the same match-grade reputation that put Peterson on the map with precision and long-range crowds. These are unprimed cases with a large rifle primer pocket, giving you a clean slate to build your own loads exactly the way your rifle likes them.
The belt is where a lot of magnum brass falls short, and it's the piece Peterson obsessed over. A crisp, properly located belt means better headspace control and more consistent case life over repeated firings. This is the standard SAAMI-spec version that headspaces off the belt, so it drops right into a factory-chambered .300 Win Mag without any fuss. Reloaders consistently report tight primer pockets, flash holes that are drilled rather than punched, and necks chamfered inside and out, which cuts down on prep before your first load.
What long-range folks really care about is uniformity, and Peterson delivers it. Shooters weighing full boxes have found case-to-case weight variation measured in fractions of a grain, which translates to repeatable powder capacity and tighter velocity spreads downrange. Wall thickness stays even, dimensions run true, and the brass holds up firing after firing when you keep your sizing reasonable. For a belted magnum, that kind of durability is a genuine selling point.
The .300 Winchester Magnum is one of the most versatile .30-caliber magnums out there, equally at home chasing elk and mule deer or ringing steel at 1,000 yards with heavy, high-BC bullets. This Peterson brass gives you a solid, accurate foundation for whatever direction you take it. One thing worth noting from reloaders who've switched over: Peterson's case capacity runs slightly tighter than some other brands, so start low and work your loads up carefully.
This is the standard SAAMI-spec version, part number 40015-R, which headspaces off the belt. Peterson also makes a separate "Long" version that headspaces off the shoulder to reduce first-firing stretch, but that is a different product. This standard brass chambers in any factory .300 Win Mag.
It uses a large rifle primer pocket. Since the .300 Win Mag is a belted magnum, most reloaders run a large rifle magnum primer for reliable ignition of the heavier powder charges. The cases ship unprimed so you can choose your own.
Peterson brass arrives with flash holes drilled and deburred and case mouths chamfered, so it needs minimal prep. Many reloaders full-length size, chamfer, and load straight away. It's still smart to size the necks and check dimensions for your specific chamber before your first run.
Not quite. Reloaders have found Peterson's water capacity runs a touch tighter than some other brands, which can raise pressures with a given charge. A common recommendation is to back your existing charge off a couple of grains and work your load up from there.
| UPC | 859449006070 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40015-R |
| Caliber/Gauge | .300 Winchester Magnum |
| Length | 7 |
| Quantity | 50 |
| Shipping Weight | 2.36 |
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