Hornady Lock-N-Load Modified Case B Series .204 Ruger

The Hornady Lock-N-Load Modified Case is a reloading accessory specifically prepared to work with Hornady Lock-N-Load Precision OAL (Overall Length) gauges. This B Series case is chambered for the .204 Ruger rifle cartridge, giving handloaders a precise, repeatable fit reference when working up bullet seating depth and confirming chamber clearance.

Each modified case is manufactured to SAAMI specifications from brass. The flash hole is cut out and replaced with a fine thread at the case-head so the case threads directly into the OAL gauge body, and the neck is .002" oversized to accept the actual bullet you intend to load. That oversized neck is the key detail - it lets the gauge replicate your real loaded-round geometry instead of a closed-neck dummy round, so the seating depth you measure on the gauge matches what the cartridge will do in your chamber.

To use, thread the modified case onto your Hornady Lock-N-Load Precision OAL Gauge, insert a bullet, seat it against the modified case, and check the resulting overall length against your published load data. The fine thread keeps the case perfectly square against the gauge for accurate alignment, making it easy to dial in the proper seating depth for any bullet weight or profile in .204 Ruger. This package includes one (1) modified case.