Use a Hornady Lock-N-Load Cartridge gauge to check cases and loaded ammo to insure a proper fit in SAAMI specification chambers. The gauges are precision machined from durable steel for a lifetime of use. Born out of one man's vision of a better product for his own use, Hornady has been a leading supplier of the finest reloading accessories and components for over sixty years.

Specifications and Features
Hornady 380718
.300 Winchester Magnum
SAAMI specification
Steel