The Hornady Lock-N-Load 45 Insert (Hornady part no. 12/45) is a caliber-specific bushing sized for .458 caliber brass and built around Hornady’s Lock-N-Load quick-change system. The insert seats into compatible Lock-N-Load tools and lets reloaders swap between calibers on the same base tool in seconds instead of unscrewing and rethreading separate components. For big-bore shooters loading .458 caliber rounds for dangerous-game rifles, having the correct insert on hand keeps case prep moving without hunting for adapters or spare parts. It is a small piece, but the right insert size is what makes the Lock-N-Load system work as intended.

Key Specifications

• Sized for .458 caliber brass, matching the insert to this bore diameter.
• Built for Hornady’s Lock-N-Load quick-change system for fast caliber swaps.

Frequently Asked Questions

What tools does this insert fit? It is designed for Hornady Lock-N-Load compatible case prep tools that use interchangeable caliber-specific inserts.

Why use an insert instead of a dedicated tool per caliber? Inserts let you swap calibers on one base tool quickly instead of buying and storing a full tool for every chambering.

Buy the Hornady Lock-N-Load 45 Insert .458 Caliber

Keep your Lock-N-Load system ready for your big-bore loads. Order it from Hornady‘s case preparation lineup, and our Lubbock, Texas team can help you round out the rest of your insert set.