Bullet-resistant 'sheet rock' from when Xcel Energy Center was built (used on their concession stands, and other places. Shot it up with .44 mag, .40 S&W, 7.62mm, 00-buck, 12ga Slug, .22LR, potato gun, and more. It was fun to see everything fail to get through, excepting the 7.62 and the 12ga sl...