The 9.3 calibers were named for their bullet diameters. The proof houses stamped the Bore diameter on the barrels. 9.3 barrels are often found with 8.8m bores. The regular 9.3x72R is a long straight tapered case while the 9.3x72R Sauer is a bottleneck case & as stated is very similar in size & shape to the 9.3x74R case, though of course 2mm shorter.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra