Brian,
Best advice to someone new to reloading is to make sure you follow the recipes exactly - hull manufacturer+ primer+powder weight+ shot weight.
I always refer to the powder companies reloading data since it is more current.
http://www.hodgdon.com/basic-manual-inquiry.html
In a previous thread, you were thinking of using Remington STS's. A very good hull that I've had a lot of great results with.
Begin with the STS hull as a starting point and go to the link and start inputting information from the pull down menus and you can see how the different load combinations with different components effect velocity and PSI.
My load for skeet, trap, clays for my old doubles:
1 oz. Lead Shot
Rem. 209P primer
Clay Buster 1100-12 wad
23 grains of IMR SR 7625 powder
5,100 PSI
1150 velocity
Here you will see Winchester and Remington primers have the best loads for low PSI but Federals are higher. Federals are generally a hotter primer = higher pressures.