well that's what drives me bonkers is that in so many publications its not clear what kind of bullet suppose to be used in these? is it 315 or 312. I have a 7.62 nagants and the bore grooves are 310. while lands on them are 300. I have pulled some surpluss bullets my friend brought from states and they measure 308-310, so i'm reloading 7.62 nagant with 308 bullets and they shoot fine. Now with this 7.5mm ammo, if any one can measure surpluss cartridge for these it would be 100% accurate than going through books and internet i think.
Thank you
G76