Actually there was no best sniper rifle during world war 2 because it was never tested. Different countries used different weapons.
German M98k
no
the MAS
A lot.
This is debatable but I'm partial to the M1 Garand for it's accuracy. The BAR was also favorite amongst the Allies.
It was called katusha.
Japan
Wood and steel.
M1 Carbine
sidearm and a rifle.
the best weapons used in WWII are, in my opinion, the; Russian Mosin-Nagant rifle US Thompson M1 submachine gun German Mauser Kar98k rifle German MP40 submachine gun