buckstix,
There is/was no common 9.3X74R Sauer +Son. The 9.3X72R Sauer +Son is mostly known through various collector's publications which show some dimensions (bullet diameter shown by collectors is sometimes smaller than the actual diameter because of measuring the portion of the bullet outside the case of a scarce sample of the cartridge, which would be damaged if the bullet was pulled to measure it), but seldom show ballistic data. One well known publication has ballistic data for many cartridges, but sometimes shows incorrect data or dimensions, and even it has nothing, but bullet weight shown. It is my unsolicited opinion that you can shoot your rifle by loading ammunition with common 9.3x74 R cases that have been trimmed by 2 mm, and the 193-grain bullet intended for the 9.3x72R normalizert or other shorter 9.3 bullets. In deference to the age of your rifle, conservative powder charges should be used. You can use normal 9.3x74R dies adjusted to partially size the cases to just "kiss" the shoulder, to prevent head separation. With your experience loading for double barrel rifles, any load that gives groups satisfactory to you will likely be "correct" one. Have fun.
Mike
