Peterson 40051-R 300 Win Mag Long 50/10
$83.74
Peterson Cartridge 300 Win Mag Long brass gives reloaders the foundation they need for precision rifle builds and long-range hunting loads. This is match-grade reloading brass designed to tight tolerances, built to Peterson's standards for consistency shot after shot. If you're assembling custom loads for a long-range rifle or building ammo for competition, Peterson's long-length design offers the dimensional control and case longevity serious handloaders depend on.
The long-length format gives you flexibility for custom trimming to your exact chamber specifications—critical when you're chasing sub-MOA groups or pushing velocity safely in high-pressure magnum loads. Heat-treated construction means these cases handle the pressures of 300 Win Mag without premature work-hardening, and uniform neck wall thickness keeps bullet seating consistent, round to round. That consistency translates directly to tighter velocity spreads and more predictable ballistics downrange.
Each box contains 50 pieces of unprimed brass—enough to set up a good test load series or keep your reloading bench supplied for a hunting season. Peterson's precision-cut flash holes support reliable ignition, so your primers fire consistently and your powder burn stays even. If you're selective about your components and you want brass that won't force you to sort or resize excessively, Peterson delivers.
Key Features
- Match-grade consistency with tight dimensional tolerances
- Long-length design for custom trimming and precision chamber fit
- Heat-treated construction for strength and extended case life
- Uniform neck wall thickness for consistent bullet seating
- Precision-cut flash holes for reliable ignition
- Unprimed—ready for your press and primer of choice
Specifications
| Cartridge | 300 Winchester Magnum |
| Length | Long |
| Quantity | 50 pieces per box |
| Condition | Unprimed |
| Brand | Peterson Cartridge |
| Part Number | 40051-R |
Frequently Asked Questions
What's the difference between Peterson 300 Win Mag Long and standard-length brass?
Peterson's long-length design gives you more material to work with for custom trimming. This is especially useful if you're loading for a specific custom chamber or if you need the flexibility to dial in length for maximum accuracy in a precision build.
Can I use this brass for hunting loads?
Yes. Heat-treated construction and uniform neck specifications make this brass suitable for high-pressure hunting loads in the 300 Win Mag. The consistency and case longevity are particularly valuable if you're planning to reload the same brass multiple times.
Is this brass primed?
No, this is unprimed brass. You'll need to run it through your priming tool with primers of your choice before loading powder and bullets.
How many reloads can I expect from Peterson brass?
Peterson doesn't publish a specific round count—that depends on your load density, pressure levels, and how you work the brass. Heat-treated construction supports extended case life, but tracking your own brass and retiring it when you see signs of fatigue is always the right practice.
