HS Munitions, Inc., HSM, is a Montana based ammunition manufacturer committed to providing only the finest ammunition to shooters, hunters, law enforcement agencies and military units.Founded in 1968, HSM has grown to become one of the leading manufacturers of specialized ammunition products in the country. With over 700 products spread across 125 calibers, you will find our products available for any shooting situation.HSM's 'Cowboy Action' line of ammunition is suitable for Single Action Shooting or hunters who want a more 'traditional' option for the field, the moderate recoil and excellent accuracy of this ammunition will satisfy all shooters regardless of application.