Fiber wads were all that were in use when Western Cartridge Co. and the A.H. Fox Gun Co. introduced the Super-X loads and the Super-Fox shotgun specially bored for these heavier/higher velocity loads in 1922. The Very early Super-Fox 12-gauge guns had .750" bores, but then they settled into .738" bores. Early on the Super-X load was essentially a progressive burning smokeless powder load put up in Western's regular FIELD or RECORD shell.