I think you've unveiled a triad conspiracy. SAAMI, Manson, and Clymer have come up with a scheme to sell 100 year old reamers. SAAMI, first, puts out a drawing that has the ancient forcing cone angle. The Manson and Clymer then sell these 100 year old reamers with old forcing cone angles to fish like me. I'd rat them out to the reamer police, but clearly they have them on the dole too. Those dirty rats. They even put conflicting reference dimensions and erroneous use of geometric tolerancing in their drawings to throw us off.