The Hornady Lock-N-Load Modified Case in .45-70 Government (Hornady part no. A4570) is a purpose-built accessory for the Lock-N-Load Precision O.A.L. Gauge, letting handloaders pull an exact overall-length reading for their own rifle’s chamber and throat. Hornady machines a fine thread into the case-head so it locks securely onto the gauge body, then resizes the neck perfectly round and opens it slightly so a standard-diameter .45-70 Government bullet slides in concentrically instead of catching or canting. That precision matters for anyone chasing a repeatable seating depth, whether they are load-developing for a precision rifle or just dialing in a hunting rig before season. It is built to SAAMI case specifications so the reading it produces lines up with the brass reloaders actually load.

Key Specifications

• Modified specifically for the .45-70 Government cartridge, matching that chamber’s exact case dimensions.
• Case-head is cut with a fine thread that locks directly onto a Lock-N-Load Precision O.A.L. Gauge.
• The case neck is resized perfectly round and slightly opened so a standard-diameter bullet seats concentrically for an accurate reading.
• Manufactured to SAAMI case specifications so gauge readings match real chamber dimensions.

Frequently Asked Questions

What is a Lock-N-Load Modified Case used for? It threads onto a Hornady Lock-N-Load O.A.L. Gauge so a handloader can measure the exact cartridge overall length that fits their own rifle’s throat and chamber for a given bullet.

Does it include the O.A.L. gauge or calipers? No, the gauge body and dial caliper are sold separately; this listing is the .45-70 Government modified case only.

Buy the Hornady Lock-N-Load Modified Case, .45-70 Government

Pick up the .45-70 Government Lock-N-Load Modified Case from Hornady and pair it with your O.A.L. gauge to nail down seating depth before your next reloading equipment session. Order it from our Lubbock, Texas gun shop for fast, insured direct shipping.