To start with, raise the ram (with shell holder installed) all the way up and screw in the FL resizing die until it touches the top of the ram and then about a quarter turn more so that the handle cams over slightly when you pull it down. That sets you up for FL sizing and will work fine.
From here, it's all about the rifle. If you want to custom size the brass for your fine bolt action rifle, you need to figure out what it wants. The simple way is just to slowly and carefully close the bolt on a piece of FL sized brass. The bolt should become more difficult to close just before it locks down if the brass is sized correctly for the rifle. The snug part is the brass being sized by the chamber, pushing the shoulder back as the bolt locks down. If your brass does not feel this way, you need to raise your die in the press by just a little, maybe a quarter turn, and lock it down with the locknut. Size a fresh piece and try the bolt feel test again. It it's too hard to close the bolt, turn the die back in just a bit to move the shoulder back and resize that brass again. Keep at it until you can feel the bolt settling in with just a bit of effort. Now, your die is custom built for that rifle, so label it so and buy another die if you have another gun to build custom brass for. If you're shooting semi auto, don't worry about this step, just FL sizing should be enough for now.
