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If you're running a .458 SOCOM and want full control over your loads, starting with quality brass is where it all begins. Starline is pretty much the household name here, and for good reason. Their cases come to you unprimed, ready for you to prep, prime, charge, and seat however your rifle likes to eat. The .458 SOCOM itself is a fun one to load for, built around a lengthened 50 AE case with a rebated .308-style head, necked up to launch big .458 diameter projectiles. While it has shown up in a few bolt guns, it earned its reputation in the AR-15 platform where it turns a standard carbine into a serious thumper.
Starline has built its name on tight tolerances and consistency, and that reputation holds up across the board from pistol calibers to big bore rifle rounds. Handloaders regularly report excellent case life, uniform weight and volume, and primer pockets that stay tight through many firings. For a cartridge like the .458 SOCOM where good brass has historically been hard to track down, having a dependable source matters. One thing worth knowing: these cases are not sized to final spec from the factory, so it's a good habit to resize before that first firing and confirm your dimensions.
Because brass is annealed during production, you may see a slight discoloration or pinkish tint near the neck where not all the anneal stain was polished off. That's purely cosmetic and has no effect on performance. Run your normal prep routine, trim to length if needed, and you're set. The listed case length falls in the 1.569 to 1.576 inch range, keeping you right in the ballpark for proper headspace.
This brass also serves as the parent case for wildcats like the .375 SOCOM, so if you're into forming your own cases down the road, these give you a solid starting point. For anyone feeding a .458 SOCOM, Starline brass is about as safe a bet as it gets.
These are unprimed cases, so you'll handle priming yourself as part of your reloading process. That gives you full control over primer choice and load development. Just add your preferred large rifle primers when you're ready to build your rounds.
Yes, it's smart to resize before the first firing since Starline brass doesn't always come sized to final spec from the factory. Running it through your sizing die and confirming dimensions ensures proper fit and headspace in your chamber. It's a quick step that pays off in consistency and safety.
That coloring comes from the annealing process during manufacturing, where not all of the anneal stain gets polished off. It's completely cosmetic and has zero effect on how the brass performs. Many reloaders tumble or polish it off if they prefer a uniform shine, but it's not required.
It can. The .458 SOCOM case serves as the parent brass for wildcats like the .375 SOCOM, which is formed by running the case through a dedicated sizing die. If you're into case forming, this is a solid foundation to work from.
| UPC | 837306005930 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 458SOCOMEUP50 |
| Caliber/Gauge | .458 Socom |
| Length | 1.569"-1.576" |
| Product Type | HANDGUN |
| Quantity | 50 Per Bag |
| Style | Large |
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