Hornady 7mm WSM O.A.L. Gauge Modified Case

The Hornady 7mm WSM O.A.L. Gauge Modified Case (Hornady part no. B7WS) is a caliber-matched accessory case that threads onto a Hornady Lock-N-Load O.A.L. Gauge, letting handloaders measure the exact distance to the rifling’s lands in their own rifle’s chamber. Made by Hornady, this case has its primer pocket drilled and tapped to accept the gauge’s threaded rod, so a bullet can be pushed gently into the lands and read off the gauge to find true seating-depth reference points. Precision and long-range shooters use this measurement to set bullet seating depth relative to the lands rather than guessing from a published cartridge overall length, which varies rifle to rifle. It’s a reusable measuring tool, not a component of loaded ammunition, and it belongs in the toolbox of anyone chasing rifle-specific seating depth.

Key Specifications

• 7mm WSM is the cartridge this modified case is chambered and threaded to match.
• Works with the Hornady Lock-N-Load O.A.L. Gauge (sold separately) to measure distance to the rifling’s lands.
• Reusable measuring tool, not a component of loaded ammunition; it contains no primer or powder.
• Drilled and tapped primer pocket accepts the gauge’s threaded rod for repeated measurements.
• One-time setup per rifle: once you’ve recorded your seating-depth reference, you don’t need to re-measure every session.

Frequently Asked Questions

What is a modified case used for? It’s a caliber-specific accessory that threads onto a Hornady O.A.L. Gauge, letting you find the exact seating depth where a bullet just touches the rifling’s lands in your own rifle.

Do I need anything else to use it? Yes, the Hornady Lock-N-Load O.A.L. Gauge, sold separately, that this case threads onto.

Buy the Hornady 7mm WSM O.A.L. Gauge Modified Case

Order the Hornady 7mm WSM O.A.L. Gauge Modified Case from our Lubbock, Texas gun shop for fast, direct shipping to your reloading bench. Browse our full lineup of reloading supplies to round out your precision seating-depth setup.