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The 6.5-300 Weatherby Magnum is a serious performer, and feeding it starts with brass you can count on. Peterson Cartridge builds these unprimed cases on a state-of-the-art case line in the USA, holding tight tolerances across case walls, primer pockets, and flash holes so every round leaves the barrel the same way as the last. For a cartridge built around high velocity and flat trajectories, that kind of consistency is what separates a good group from a great one.
This is not a simple case to manufacture. The 6.5-300 is the .300 Weatherby Magnum necked down to .264 caliber, which means it carries the belted head and the signature double radius shoulder that Roy Weatherby was known for. Peterson has openly talked about the headaches that came with it, from a belt that differs from other belted magnums to tolerances running about half of what you see on typical belted brass. The payoff is cases that form cleanly and headspace off the belt the way the cartridge was designed to.
This brass ships unprimed and ready for your own load workup, so you pick the primer, powder, and bullet. The 6.5-300 uses a large rifle magnum primer, and most published data leans on a magnum primer like the CCI 250 or Federal 215 to get clean, consistent ignition from that big powder column, especially in colder weather. With a 2.825 inch case length and a 3.600 inch max overall length, this is a magnum-length cartridge, so make sure your dies and press are set up for it before you start.
Peterson is a family-owned maker that caters to long-range and PRS crowds, and reloaders consistently report tight, uniform cases that hold up through multiple firings when they take care of them. For a barrel-burner like the 6.5-300 that already demands your attention, starting with brass this uniform means one less variable to chase. Load it up, work your node, and let the case do its job.
No, this brass ships unprimed so you can choose your own primer, powder, and bullet for your load workup. The 6.5-300 Weatherby Magnum uses a large rifle magnum primer. Most published load data relies on a magnum primer such as the CCI 250 or Federal 215 for consistent ignition from the large powder charge.
It takes a large rifle magnum primer. Because the cartridge holds a big powder column, a magnum primer helps deliver clean, uniform ignition, which matters even more in cold weather. Check your specific load data before settling on a primer.
No, the 6.5-300 Weatherby Magnum is a magnum-length cartridge with a 2.825 inch case and a 3.600 inch maximum overall length. It requires a magnum-length receiver and dies set up for the cartridge. Make sure your rifle and reloading gear are built for it before loading.
Peterson manufactures these cases on a modern case line in the USA with tight control over case walls, primer pockets, and flash holes. The 6.5-300 is a tough case to make thanks to its belt and double radius shoulder, and Peterson holds tolerances roughly half of typical belted magnum brass. Reloaders report consistent, durable cases that hold up through multiple firings with proper care.
| UPC | 850005375920 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 40059-R |
| Shipping Weight | 2.4 |
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