buckstix,
I don't have drawings, but the head diameter of 9.3x74R is supposed to be.468" (usually smaller) vs. .473" (I don't have original cases to check original dia.) for the S+S, and the S+S case is 2mm (nominal) shorter than the 74R. My own 9.3x72R S+S will chamber 9.3x74 R cartridges because the cases are heavily crimped into the crimping groove of the bullet, allowing it to enter the shorter chamber. I found out early that it would not shoot bullets longer than the 286-grain round nose. It was not until I came home to the US and started handloading ammo with shorter 250 grain spitzer bullets that I discovered that a 250-grain bullet would not enter a 9.3x74R case fired in that rifle but would enter a case fired in my Heym double rifle. I now just shorten the cases 2mm and load them with 9.3x74R dies and charge weight. It should be noted that proof marks included the bore diameter, but not case length. Also, it was obvious that a 9.3x72R normalizert case is way too small diameter for the chamber.
Mike
