Could a Tankgewehr Really Take Out a British MkIV Tank?

The Tankgewehr antitank rifle was developed by the Mauser company and adopted by the Imperial German military as an emergency measure to counter the introduction of tanks to the WW1 battlefield. The question is, did they really work? Could a AP bullet from a Tankgewehr really perforate the armor of a British tank? Well today we find out! The armor on a British tank was steel plate of 6mm, 8mm, and 12mm thickness, through-hardened to Brinell 440-480. We have replicated this with a plate of AR450 (ie,