"The 300 PRC is an intelligently crafted 21st century magnum cartridge specifically designed to take advantage of long, heavy for caliber bullets capable of delivering the highest levels of accuracy and aerodynamic performance.
Based on the 375 Ruger cartridge case, the 300 PRC is non-belted and uses a standard .532” magnum bolt face and headspaces off the 30 degree shoulder. This results in better chamber alignment than standard belted magnum cartridges and allows for improved stacking and feeding from fixed magazines.
The 300 PRC cartridge and chamber were designed concurrently combining to provide excellent alignment and highly tuned performance. The cartridge case is designed to use common, temperature stable, magnum speed rifle powders producing extremely consistent velocity and increased barrel life compared to currently available magnum cartridges." -- Hornady
