The Hornady B764 Lock N Load Modified Case is a precision diagnostic tool designed specifically for the 7x64 Brenneke cartridge. Manufactured from factory brass to standard SAAMI/CIP dimensions, it allows handloaders to accurately measure the distance from a bullet's ogive to the rifling lands in a rifle's chamber. The case head features a standardized 5/16"-36 fine thread that mounts directly to Hornady Lock-N-Load Straight (C1000) and Curved (C1550) Overall Length (O.A.L.) Gauges, delivering repeatable headspace and seating depth data without requiring improvised tools or simulated bullets.

Key Features

• Precision Neck Modification: Features a case neck expanded by .002" over factory dimensions to provide a smooth, slip-fit bullet insertion that maintains concentricity with your actual loading projectiles.
• Threaded Interface: Uses an industry-standard 5/16"-36 fine thread to secure tightly to Hornady Lock-N-Load O.A.L. Gauges for consistent axial alignment.
• Measurement Precision: Enables handloaders to establish chamber distance-to-lands and seating depth dimensions accurate to within .001".
• Factory Calibre Profile: Built to standard 7x64 Brenneke cartridge dimensions (~64 mm nominal case length) to mirror factory sporting rifle chambers.
• Inert Mechanical Operation: Functions as a purely mechanical diagnostic tool for load development, requiring no power source or electrical interfaces.

Product Specifications

• Manufacturer: Hornady Manufacturing Company
• Model Number (MPN): B764
• Calibre/Chamber: 7x64 Brenneke
• Projectile Diameter Compatibility: Standard 7mm (.284")
• Thread Pitch: 5/16"-36 fine thread
• Neck Expansion: .002" oversized slip-fit
• Measurement Accuracy: Within .001"
• Nominal Case Length: ~64 mm
• Unit Weight: Approximately 15–25 g (single cartridge brass weight)
• Tool Compatibility: Hornady Lock-N-Load Straight (C1000) and Curved (C1550) O.A.L. Gauges

Who is the Hornady Lock N Load Modified Case 7x64 Brenneke for?

• 7x64 Brenneke Precision Handloaders — Threads via a 5/16"-36 fine thread into an O.A.L. gauge to accurately gauge chamber headspace and throat contact for European sporting rifles chambered in 7x64 Brenneke.
• Long-Range Target Shooters and Hunters — Utilises a .002" expanded neck to allow slip-fit insertion of target projectiles, establishing bullet jump and seating depth accurate to within .001" using this reloading modified case.

Less suitable for: Rifles chambered in alternative 7mm calibres such as 7mm Remington Magnum, .280 Remington, or 7mm-08, as well as tight custom benchrest chambers requiring a custom gunsmith-tapped fireformed case.