The Official Star Wars Fact File (#22) describes Fett's execution of Wessell as being typified by "deadly precision". If that's not a synonym for 'sharpshooter', I don't know what is.
Zam's second attempt to kill Senator Amidala was
similarly thwarted when Padme's Jedi bodyguard and his
Padawan rescued her from an assassin droid and its cargo