Hornady B7MMP Lock-N-Load Modified Case 7mm PRC Brass

The Hornady B7MMP Lock-N-Load Modified Case provides precision reloaders with a specialized tool for accurate cartridge overall length (COAL) measurement in 7mm PRC chamberings. This modified case eliminates guesswork when determining optimal bullet seating depth for maximum accuracy and proper chamber fit.

What Makes This Different

Unlike standard fired cases that may have inconsistent neck tension or dimensional variations, this factory-modified case features precisely machined specifications that ensure repeatable measurements. The case body maintains exact 7mm PRC dimensions while the modified neck allows the Lock-N-Load Cartridge Overall Length Gauge to function with consistent pressure and alignment. This eliminates the trial-and-error process of using fired brass for seating depth determination.

Key Features

• Factory-modified 7mm PRC case engineered for Lock-N-Load OAL Gauge compatibility
• Precisely machined neck dimensions for consistent bullet grip pressure
• Maintains SAAMI-spec case body dimensions for accurate chamber representation
• Eliminates need to fire-form cases for measurement purposes
• Compatible with Hornady Lock-N-Load Cartridge Overall Length Gauge
• Reusable design for multiple measurement sessions
• Quality brass construction ensures dimensional stability

Accurate cartridge overall length measurement directly impacts both accuracy potential and safe chambering in precision rifles. This modified case allows reloaders to determine the exact distance to the rifling lands, enabling optimal bullet jump calculations for match-grade ammunition. The consistent neck tension ensures repeatable measurements across different bullet weights and profiles, critical for load development in competition and long-range hunting applications.

Technical Specs

• Caliber: 7mm PRC (Precision Rifle Cartridge)
• Case type: Modified brass case for measurement tool use
• Compatibility: Hornady Lock-N-Load OAL Gauge systems
• Material: High-quality brass construction
• Function: Cartridge overall length and bullet seating depth measurement
• Manufacturer: Hornady Manufacturing
• Country of origin: United States

This modified case represents an essential tool for serious 7mm PRC reloaders seeking maximum accuracy from their handloads. The precision manufacturing ensures consistent results that translate directly to improved ammunition performance and reduced load development time.