What is bigger than a 50 bmg?

A cartridge larger than the .50 BMG (Browning Machine Gun) includes the .20mm caliber, such as the .20mm Vulcan, which is used in aircraft cannons. Additionally, artillery shells, like those fired from a 155mm howitzer, are significantly larger in caliber. Other examples include the 105mm and 120mm tank rounds, which are also much more substantial than the .50 BMG.