Manufacturer: Hornady A300R
The Hornady Lock-N-Load Overall Length Gauge Modified Cases are threaded to fit onto the Lock N Load overall length gauge tool, and have slightly oversized case mouths to allow the bullet to slide easily to establish proper bullet seating depth.
These cases are specially modified to work with Lock-N-Load Precision gauges. A special fine thread is used to attach them to the gauges, ensuring that they remain perfectly square for precise alignment in the chamber of your firearm. Second, the neck of the case is made perfectly round and opened slightly to allow a standard diameter bullet to slip into the case mouth effortlessly, but concentrically, to ensure the most precise results possible.