it happens from time to time, i have just tested with a clean install of world of tanks on a different computer and it also is present there, plus 4 of my clan are experiencing the same issue non mod xvm players
When I zoom past x1 the gun sounds are not there it is quite annoying when you don't hear the shot, maybe it is the zoom mod that is broken or the harpoon sight?
I have tested with and without / without all works fine and with then the porblem is there