 Besides changing the shape and internal volume of the parent cartridge case, wildcatters also can change the original calibre.A reason to change the original calibre can be to comply with a minimal permitted calibre or bullet weight for the legal hunting of certain species of game or change external or terminal ballistic behavior.In his spare time Chis E. Murray has been developing a cartridge which he calls the 7×46mm Universal Intermediate Assault Cartridge.