Last reviewed: 2026-04-17 by Jake Terry, FFL07/SOT3, outdoor product specialist.
Starline 450 Bushmaster brass gives AR-platform hunters a factory-new, unprimed case built for the straight-wall cartridge that opened whitetail season to modern sporting rifles in Michigan, Ohio, Indiana, and Iowa. The 450 Bushmaster pushes 250–300 grain bullets at 2,100–2,200 fps from a standard 16–20 inch AR barrel, and brass quality directly affects how many firings you get before the case stretches or the primer pocket loosens under 38,500 psi SAAMI max pressures. Each case is vertically drawn from 70/30 copper-zinc alloy, annealed between draws, and hand-inspected before bagging for uniform wall thickness and consistent primer pockets.
Load Profile
Starline Brass has manufactured brass in Sedalia, Missouri for over 30 years. Their vertically drawn process means you spend less time sorting case weight and concentricity, and more time at the press. Bag of 50, new and unprimed — not loaded ammunition. Full-length size, trim to length, and chamfer inside and outside before your first load cycle.
Fit & Compatibility
| Spec | Value |
|---|---|
| Cartridge | 450 Bushmaster |
| Finish | Brass (70/30 Cu-Zn) |
| Condition | New |
| Primed | No |
| Primer size | Small Rifle |
| Quantity | 50 pieces (bulk bag) |
| Country of origin | United States |
| Manufacturer | Starline Brass |
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Safe Handling & Compliance
This product is an unprimed brass case — it is not loaded ammunition. Follow published load data from a reputable reloading manual and never exceed maximum charges listed for your bullet weight and powder type.
- Review the 4 rules of firearms safety before handling any firearm or component.
- Check your state and local laws — straight-wall cartridge requirements vary by state and season.
- Store brass in a cool, dry location away from heat sources and out of reach of unauthorized users.
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