I would agree with HRL except for the self-energizing nature of drum brakes (I not familiar with Huck, but Bendix are). Once the leading shoe makes contact, the rotation of the drum helps engage both shoes, thus one wheel can brake sooner than another, despite the uniform hydraulic pressure HRL mentions.
http://web.bryant.edu/~history/h364proj/sprg_97/dirksen/brakes.html
Now for adjusting - With the drum installed and working through the access hole, adjust the shoes while rotating the drum until the drum is locked up. This is the most important step since it seats and centers the shoes. Back the adjustment off a few notches until a light uniform drag is felt (a little more drag with new shoes). Since I learned this method, our drum brake vehicles stop straight.
