The russian anti tank rifle was called the PTRS, and was very effective in ambushing Panzers. Anti tankn guns were also good at this. I read about one soldier in stalingrad who used the anti tank rifle to snipe. He even added a scope.

__________________
"Goddam it, you'll never get the Purple Heart hiding in a foxhole! Follow me!" Captain Henry P. Jim Crowe - 13th January 1943 - (Guadalcanal)