The Hornady A300A Lock-N-Load Modified Case is a critical precision tool for serious reloaders working with 300 Blackout rifles. Machined from premium brass to SAAMI specs, this specialized case features a threaded head designed to seamlessly interface with Hornady’s Lock-N-Load Overall Length (O.A.L.) Gauge and Headspace Gauge systems. The A300A enables shooters to accurately measure chamber dimensions, bullet seating depth at the ogive, and headspace for custom handloads, maximizing reliability, accuracy, and brass life. By using actual bullets, not simulated shapes, the modified case ensures true, repeatable measurements for every firearm.
Key Features:
- Caliber: 300 Blackout (AAC/Whisper)
- Model: A300A (Lock-N-Load Modified Case)
- Material: Brass (SAAMI specification, corrosion-resistant finish)
- Function: Threads onto O.A.L. and Headspace Gauge for precision measurement
- Enables:
- Exact bullet seating depth at ogive
- Reliable COAL (Cartridge Overall Length) measurement
- Chamber headspace diagnostics
- Custom die setup for extended brass life
- Compatibility: Hornady Lock-N-Load O.A.L. Gauge (C1000 straight, C1550 curved) and Lock-N-Load Headspace Gauge
- UPC: 090255706154
Why Choose Hornady Modified Case Tools?
- Achieve true, repeatable chamber measurements—not simulated bullet tips
- Ideal for competitive shooters, handloaders, and precision hunters
- Prevent pressure spikes, unsafe cartridge fit, and maximize brass longevity
- Easy to use, durable, and manufactured to exacting standards
| MANUFACTURER | HORNADY |
| CALIBER | 300 BLACKOUT |