The Hornady Lock-N-Load Modified Case for Overall Length Gauge Modified Cases are needed to measure the bullet relationship to the lands of a barrel when being used with the Hornady Lock-N-Load Overall Length Gauge.  *Overall Length Gauge Sold Separately.

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.

Modified cases are threaded at the case head and have a .002-inch oversized neck to accept the same bullets you intend to load. This is critical as the L-N-L OAL gauge dimensions obtained will be accurate to .001 inch. Made In The USA.

Features:

• Modified cases for use with Precision Gauges.
• Uses fine thread to keep case square for precise chamber alignment.
• Rounds neck of the case and opens to allow a standard diameter bullet to slip into the case mouth.
• One modified case per package.
• Modified cases will not work in tight neck chambers.