P.O. Ackley created several �improved versions of well known cartridges. In the .30 caliber section he did the 30-30 Winchester and 30-06 Springfield, but he actually never did the 308 Winchester. The 308 AI got it name by the classic 40 degree shoulder angel. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.