[4] By 1967–68 he had developed his medium-paced bowling, and he played five games as an all-rounder, making 176 runs at an average of 19.55,[5] including his first fifty, 69 against Central Districts, and taking four wickets at 52.25.
He was chosen to tour the West Indies with the New Zealand side in the following months as an all-rounder and reserve wicket-keeper, although he had not yet kept wicket in a first-class match.
[9] In 1972-73 Campbell had his best season with the bat, scoring 324 runs at 46.28, top-scoring in each innings with 111 and 63 not out in a victory over Central Districts.
He toured Australia with the New Zealand side in 1973–74, keeping wicket in the first three first-class games in place of Ken Wadsworth, who was ill.
He continued to play in the Plunket Shield (and its successor, the Shell Trophy) until 1978–79, scoring his third and final century, 101 not out, in a victory over Central Districts in 1977–78.