You re right about the rifle does not make the man. There is a big difference between a 'sharpshooter' and a 'sniper'. The sniper rifles themselves were pretty much all the same standard and the calibres weren't that far apart.It was more to do with the user, although the Japanese had a 7.5mm rifle which had a barrel so long that the propellant was completely burned out by the time the round left the barrel, which in turn meant that was no 'muzzle flash' whatsover. This meant that a well concealed sniper would very unlikely be discovered. A massive advantage, which is unrivalled even today. I have actually fired the three main wwii rifles,the mosin-nagant , mauser kar98 and the lee-enfield ,and i must admit, the differences in accuracy and comfort were minor, howver, being a Brit, if push comes to shove, I'd run with the lee-enfield.