Can bouncing bullets hit another tank?

Solution 1:

No, this is not possible. A bullet is able to hit the same tank twice (by bouncing of one point of armor, into another point). But it is not possible to bounce off and hit another tank.

Once a shell hits a vehicle it is "bound" that vehicle and can't hit anything else.

The only way to hit two targets with one shell is by using high explosive shells, this mostly happens with SPG shells landing right next to two targets, with the shockwave damaging both.

Source: WOT battle mechanics richochet section

Solution 2:

Since 9.3 it is possible to bounce and kill another tank, the one firing gets the kill.