Steve Herrett and Bob Milek developed the round for Elk, moose, and other large game after developing the .30 Herrett. Both are based on cut down .30/30 brass. The .357 is slightly longer if I remember correctly. Both were designed for the 10" barrel, so you don't gain that much going to a 14' er. The .30 was very popular for quite a while, while the .357 never really seemed to catch on. One problem may have been the availability of the .35 Remington with factory ammo available. Loaded properly, with bullets designed for the velocities it produces, the .357 is a fine 200 yard round.