Description
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 Hornadys 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 measurementsnot 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
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