A Czech ammo export catalog, undated (but said the 9.3x74R was recently introduced so early 1900's), included pressure numbers for their loads (in kg per square cm). I'm pretty sure one is a typo as you will see. 
6.5x41R (25-20) 2800=39,825psi @1525fps [maybe should be 1800=25,602psi] 
6.5x52R (25-35) 2200=31,291psi
6.5x58R (because I have one) 2500=35,558psi
7x65R (because I have one) 3300=46,937psi
8.15x46R 1500=21,335psi
8x57R(360) 2200=31,291psi @1935fps
9.3x57R(360) 2600=36,980psi @1900fps [although factory it sounds too hot for Husqvarna 33 RBs]
9.3x57 (because I have one) 2600=36,980psi
9.3x72R 1800=25,602psi
9.3x74R 3000=42,670psi
Forgot to add that their proof loads were +33%.