After his release from the military, Wilhelm returned to the Moors for the 1946 season, and earned 41 wins over the 1946 and 1947 seasons. He later recalled being dropped from a Class D minor league team and having the manager tell him to forget about the knuckleball, but he persisted with it. The Boston Braves purchased Wilhelm from Mooresville in 1947, and on November 20, 1947, he was drafted by the New York Giants from the Braves in the 1947 minor league draft.