no offense, but unless your new production ammunition is loaded by norma, lapua, sellier belloit, or the russian army it is not to full russian pressure spec.
the mosin rifle has been loaded to many different pressure levels based upon what bullet was used, but they were all designed to take more then the military pressure. why/ because the russian government realized that ammo factories were creating ammunition that was too high pressure at times.
ive even seen online accounts of the RIFLES using the higher pressure air craft machine gun ammo CASES at a time with no issues. even seen reports of people putting whole boxes of PROOF LOADS through with no issue other then extraction