In my experience in reloading. When I first set my resizing die I lube well, use a smokey kitchen match to blacken the neck and a bit of the shoulder. Leave the dies unscrewed a few turns.
Run the case up into the die. Remove and look at the neck. You should see the black pushed down the neck part way. Screw the die in a bit. Run the case in and out, check the black.
Keep repeating this till the black just touches bottom of the neck with it just touching the black on the shoulder.
Now clean the case off. Test this case for fit in your rifle. Will the bolt close easily? Or does it take a bit of force? If it's a bit tight then screw the die in and resize another case and test fit it in the rifle. At some point you will find a point where you are resizing the case to a point where the headspace is at a minimum.
Now try this case with the tape to see how much space you have.
Leo