But testing showed chamber pressures to be excessively high. During a public demonstration, the round successfully penetrated the U.S. Testing was done with a Remington 722 rifle with a 22-inch Apex barrel. He used DuPont IMR4198, IMR3031, and an Olin powder to work up loads. Robert Hutton (technical editor of Guns & Ammo magazine) started development of a powder load to reach the 3,300 ft/s (1,006 m/s) goal. Using a ballistic calculator, they determined that a 55-grain bullet would have to be fired at 3,300 ft/s (1,006 m/s) to achieve the 500-yard performance necessary. Stoner and Sierra Bullet's Frank Snow began work on the. As a result, CONARC ordered rifles to test. In May 1957, Stoner gave a live-fire demonstration of the prototype of the AR-15 for General Willard G. Harvey was ordered to cease all work on the SCHV to avoid any competition for resources.Įugene Stoner of Armalite (a division of Fairchild Industries) had been advised to produce a scaled-down version of the 7.62mm AR-10 design. Concurrently with the SCHV project, Springfield Armory was developing a 7.62mm rifle. 222 Remington cartridge case to meet the requirements. Springfield Armory's Earle Harvey lengthened the. Accuracy and ballistics equal to M2 ball ammunition (.Penetration of 0.135 inches (3.43 millimetres) steel plate at 500 yd (457 m).Penetration of US steel helmet through one side at 500 yd (457 m).Select fire for both semi-automatic and fully automatic use. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |