Head over to your local library and see if they on the outside chance have a copy of the Lyman Shotshell Manual. Even if it is an older one you will quickly see what folks ahve been referring to.
Loading shotshells is like cooking, you follow the recipe or you end up with a bad taste in your mouth. THe lyman manual details all the different loads for the individual type of shell, it list the primers powder, wads, weight of charge, such and so forth. You basically look what supplies you have locally and then pick the best load for the cases you have to use them in. THey aren't all Win-Win and Rem- Rem, but pretty close.
Your savings will come with the volume at which you use them, and which loads your working with. As mentioned for a casual half to a dozen or so boxes a year I wouldn't sweat it. When I was shooting, I would burn through a case a week easily. Using the WW shells, and duplicating the factory loads I easily paid for my equipment and then some. This was MANY years ago and even though I only started out with a single stage press, I was still in school and could easily burn the midnight oil to keep my shell box topped off.