Starline Brass 300 Blackout Unprimed Cases - 100 Count Bag

The Starline Brass 300BLKEUP100 delivers consistent case dimensions and reliable performance for precision 300 Blackout handloading. These unprimed brass cases provide the foundation for accurate ammunition development across subsonic and supersonic loads.

What Makes This Different

Starline Brass cases undergo multi-stage quality control testing to ensure uniform wall thickness and precise headspace dimensions. Unlike mass-produced alternatives, each case receives individual inspection for flash hole consistency and proper case mouth preparation. The brass alloy composition provides optimal expansion characteristics while maintaining structural integrity through multiple reload cycles.

Key Features

• Precision-drawn 70/30 brass construction for consistent case capacity
• Uniform wall thickness within 0.001" tolerance for balanced pressure distribution
• Flash holes deburred and sized to 0.080" diameter specification
• Case mouths chamfered and deburred for smooth bullet seating
• Headspace dimensions held to SAAMI specifications ±0.002"
• Compatible with standard 300 Blackout chamber dimensions
• Packaged in protective bags to prevent damage during storage

These cases perform reliably across the full spectrum of 300 Blackout applications, from 125-grain supersonic hunting loads to 220-grain subsonic tactical ammunition. The consistent internal volume supports predictable powder burn rates and velocity spreads under 20 fps. Case necks maintain proper tension through 8-10 reload cycles when properly sized and trimmed.

Technical Specs

• Caliber: 300 AAC Blackout (7.62x35mm)
• Case length: 1.368" nominal
• Material: 70/30 cartridge brass alloy
• Flash hole diameter: 0.080"
• Primer pocket: Large rifle standard depth
• Package quantity: 100 pieces per bag
• Country of origin: United States
• Condition: New, unprimed brass cases

Starline's reputation for dimensional consistency and quality control makes these cases the preferred choice for competitive shooters and serious handloaders. The 100-count packaging provides sufficient quantity for load development while maintaining cost efficiency for precision ammunition production.