Frontier Ammo Loaded to SASS specifications with authentic Hornady Cowboy bullets. Flat Point Cowboy Bullets The flat point shifts the center of gravity to the bulletÆs rear for increased stability and accuracy. This ensures proper positioning in authentic revolvers, with no unwanted nicking of primers as the cylinder turns. Special Knurling and Grease Ring The knurling system holds an even distribution of lubricating wax over the bearing surface of the Cowboy bullet. The grease ring catches wax as the bullet travels through the barrel. The result is less leading.