Before developing the current 9.3 B&M I had SSK Industries convert 2 Winchester M70s to 9.3X338 Winchester with 22 inch barrels, and a Winchester M70 to 9.3 Ultra. Shortly later I developed the 9.3 B&M and have done all of the terminal bullet performance work with the 9.3 B&M. In fact I have all but lost interest in the other two cartridges. The 9.3 B&M takes care of any need or desire I have in 9.3 caliber.
9.3 B&M Terminal Bullet Performance