Study to Increase Gun Barrel Life by Plating the Bore with Tungsten
Technical Report,24 Jan 1968,22 Oct 1968
AC ELECTRONICS-DEFENSE RESEARCH LABS SANTA BARBARA CA SANTA BARBARA United States
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A 0.004 inch oversized .220 cal rifled gun barrel was plated with 0.002 inches of tungsten, thereby restoring its original bore size. The plated barrel and an unplated standard barrel were test fired with 1500 rounds of .220 caliber sport ammunition. This ammunition has a 48 grain projectile and was test fired at an average muzzle velocity of 3790 ftsec with an average chamber pressure of 48,350 psi. The bore diameters as measured in both test barrels before firing and after firing 500, 1000 and 1500 rounds are listed. Less erosion was experienced over a shorter barrel length in the tungsten plated barrel than in the unplated barrel.