Ozzistraightshooter Chamber Headspace Gauge 
set for 300 Winchester Magnum.
 
Precision 300 Win Mag head-space gauge set.
Made to CIP European standard dimensions.
Perfect to check your Belted Magnum to ensure safety.
 
Set includes GO gauge and NO-GO gauge.
 
With these tools you can check the cartridge headspace.
 
These are top quality tools designed for professional use.
Should only be used by a professional Gunsmith.
 
Made in Serbia from German Bohler S705 steel.