Since 1965, AA® has been recognized as one of the best target shooting loads ever developed, continuing the WINCHESTER® tradition of legendary excellence with unmatched target-busting performance that revolutionized target shooting and the reloading industry . Shooters who have reached champion level use anything that gives them an advantage to win. Most of these competitors systematically choose to use loads for "AA" target shooting. 1 Violent impact Lead balls alloyed with 6% antimony 2 Excellent reloading capacity Brass base and high resistance tube 3 Tight sprays AA® Wad Technology 4 Constant and clean combustion The best primer and the best powder of its kind category.