The choice is not between 9.3x72R norm and 9.3x74R; but between 9.3x72R Sauer and Sohn and 9.3x74R.From the dimensions of the chamber casts, you can see the reason for the confusion. I believe the next step would be to fire a 9.3x74R in the shortest chamber, and then check to see if a 9.3(.365-.366") bullet will easily enter the neck of the fired case. If it does,then use 9.3x74R ammo, with confidence. If not, trim cases to 72mm and load as usual, with 9.3x74R dies. If it is the S&S version, it may require "short" bullets.Bullets longer than the 286gr RN would not stabilize in my rifle.
Mike
Ok just to make sure my order of operations is correct...
1 - Buy box of 9.3x74r ammo.
2 - Pull bullet from one cartridge.
3 - Fire one cartridge in shortest chamber.
4 - Attempt to slide pulled bullet into neck of fired case. If it slides in easily, I have a 9.3x74r rifle and am finished. If it does not slide in easily the rifle is 9.3x72r Sauer.
5 - If it is 9.3x72r Sauer, pull bullets from all cases. Trim brass to 72mm (or spec), replace powder (to correct load levels), cap with pulled .366 diameter bullets and I am good to go.
