Personally, all my USN gunners went acc/rld/rld.
Reason being was being able to block shot in the Cleveland and Baltimore matter when I originally grinded through them. Landing 9 shells at a time instead of 5 made a complete difference in the old normal rooms.
You end up after the 3rd classing with low 30s accuracy growth and mid 20s reload growth.
With sufficient vets, you start capping accuracy in the upper 80/lower 90s and reload in the late 90s/early 100s.