A-Square was founded by Retired Lt. Col. Arthur B. Alphin. A noted safari hunter and author of Any Shot You Want, Art, set out to build the toughest and most powerful safari rifles in the world, a task he fully succeeded in. He also designed powerful new rounds for these cartridges including the 500 A-Square, 495 A-Square and the 577 Tyrannosaur, adoringly called the 577 T-Rex by its fans.