I full length resize....how do I know if I'm pushing the shoulder back to far? When I set my sizer die I spin it down until it hits the shell holder the go about a quarter turn more.
You should set your die to your chamber. Size a case long and try it in your chamber. The action should not close. Turn the die in a half turn and resize the case and try it in your chamber again. Continue trying resizing the case as you turn the die down until the action closes but you feel some resistance. Now turn the die down another half turn and lock it. Resize a fresh case to make sure it chambers. If it doesn't, repeat the process, if it does you are good to go.
The above is referring to a bolt action.
Miles beat me to it.
