Handloaders chasing consistent seating depth in 7mm PRC rely on the Hornady Lock-N-Load Modified Case (brand part no. B7MMP) to get there. This SAAMI-spec 7mm PRC case threads directly onto the Hornady Lock-N-Load Overall Length Gauge, letting you seat a bullet by hand until it contacts the lands and read the true overall length for your specific chamber. That measurement is the starting point for dialing in seating depth on precision rifle loads instead of guessing from a load manual’s generic figures. Built to fit popular 7mm PRC chambers, it’s a dedicated bench tool rather than a piece of loadable ammunition brass.

Key Specifications

• 7mm PRC chambering matches this modified case to your rifle’s exact chamber dimensions.
• SAAMI-spec manufacturing ensures the case duplicates a real 7mm PRC chamber closely enough for a repeatable reading.
• Lock-N-Load OAL Gauge compatible threads directly onto Hornady’s gauge (sold separately) for seating-depth measurement.
• Fits most popular 7mm PRC chambers rather than one specific rifle model, so it works across a range of factory and custom builds.
• Not a loadable or primable cartridge since its sole purpose is bench measurement, not firing.

Frequently Asked Questions

Does this case fire live ammunition? No, it’s a dedicated modified case for measuring seating depth, not loadable or primable brass.

Do I need any other tools to use it? Yes, it threads onto the Hornady Lock-N-Load Overall Length Gauge, which is sold separately.

Buy the Hornady Lock-N-Load Modified Case, 7mm PRC

Dial in your seating depth with this Hornady modified case from our reloading equipment selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.