I'd be interested in hearing about those P-14 rifles, or would they be designated as No.3 rifles, after 1926 perhaps? and whether either or both had been used in WW2 or WW1 only.
Also perhaps you can tell us what sort of ammo types were approved for use with the P-14 based sniper rifles. I've seen it said that MkVIIIz was sometimes used for extra long range work, and that there were a few specialized target grade loads issued during WW1.