I thought this would be a fun picture. I grabbed different types of empty brass that I had lying around and lined them up in ascending order. They include from left to right: .22 LR, .32 ACP, .380 ACP, 9mm Luger, .40 S&W, .45 ACP, .45 Long Colt, .50 AE, .500 S&W.
The last (furthest to right) is the bottom section of a 30 x 173 mm fired from the GAU8 Gatling style cannon. This is the round used in the A-10 Warthog tank killer. Given to me as a gift, it apparently was coated in a lacquer, artistically painted upon, and intended to be used as a shot glass. Considering that this particular round fired depleted uranium projectiles at a velocity of somewhere around 3,300 ft/second and at a rate of 3,900 rounds per minute, it’s no wonder they called the A-10 a tank killer.