The Hornady Lock-N-Load Cartridge Gauge (MPN: 380712) is a precision-machined mechanical inspection tool engineered to verify the exterior dimensions of 7mm-08 Remington ammunition. Machined from high-carbon steel to SAAMI maximum allowable cartridge dimensions, this tool provides a rapid, one-step qualitative pass/fail standard. Handloaders drop resized cases or completed factory and handloaded rounds directly into the gauge to confirm that case diameter, shoulder headspace, and overall case length meet strict dimensional thresholds before chambering in a rifle.

Key Features

• Machined High-Carbon Steel Construction: Offers durable, solid-steel wear resistance to maintain strict SAAMI internal tolerances over repeated drop-in inspections.
• Flushed Datum Step Surfaces: Features machined minimum and maximum reference steps on the top and bottom surfaces, allowing quick visual and tactile confirmation of shoulder bump and trim length.
• Chamber Jam Prevention: Identifies expanded case bodies, improper shoulder setback, and over-length brass during batch inspections to prevent cycling failures in the field.
• Purely Mechanical Operation: Requires no electrical supply, batteries, or calibration electronics for benchtop quality control.

Specifications

• Manufacturer Part Number (MPN): 380712
• Calibre Compatibility: 7mm-08 Remington (.284 calibre)
• Chamber Standard: SAAMI maximum allowable cartridge dimensions
• Material: Machined high-carbon steel
• Measurement Type: Qualitative Go/No-Go drop-in standard
• Power Requirements: Manual mechanical tool (non-powered)

Who is the Hornady Lock-N-Load Cartridge Case Length Gage for 7mm-08 Remington for?

• Australian handloaders reloading for medium game — provides a fast Go/No-Go check to ensure .284 calibre brass matches SAAMI maximum allowable cartridge dimensions, preventing feeding jams during hunting trips targeting fallow deer, red deer, or wild pigs.
• Reloaders inspecting batch-processed brass — speeds up quality control by using flush-ground datum steps to verify that resized 7mm-08 Remington cases conform to standard headspace and trim-length limits without handling individual calipers for every single case.

Less suitable for: Handloaders who need quantitative measurements in thousandths of an inch for exact shoulder setback or projectile jump to the rifling; a dedicated comparator kit or overall length gauge tool is required instead. It is also incompatible with non-standard variants such as 7mm-08 Ackley Improved, 7x57mm Mauser, or .308 Winchester.