I always adjust the brakes till the drum can barely turn by hand. Than apply the brake a few times and check again by rotating the drum. If it rotates freely I keep doing this till there is no more change then back out the adjuster till there is just a slight touch sound as the brake drum rotates. If the auto adjusters are working correctly a few back up stops will put the shoes into the final position.
Another thing to look at is the flats the shoes ride on, on the backing plate. If there is a heavily warn in pattern it can sometimes keep the shoe from moving freely.
