The .338 Caliber Modular Headspace Comparator Bullet Insert is designed to measure bullets with a unique 3.0 degree lead angle for precise contact, mimicking barrel contact.
It is necessary to purchase the Modular Headspace Comparator Body separately to use these bullet inserts.
These bullet inserts are manufactured from 17-4 Stainless Steel, ensuring durability and accuracy for measuring bullets and loaded ammunition.