Bart,
The Larry Willis link is working now. Must have been a temporary situation.
Deepforks,
That Hornady Gauge case tap is a 5/16"–36 tpi. They are
available from MSC. The
tap drill size for 65% thread is a letter L drill. You can hold cases in a Wilson case holder during the drilling and tapping operation if you have one.
Zplinker,
Bart acknowledged that he'd missed the adjustment part of your post. Neither of you said anything technically incorrect in the end, so let's take the win-win and let readers pick and choose whatever degree of detail interests them.
It should be explained to those not following that a full length die first squeezes the body of a case down before its shoulder finds the shoulder in the die. That lengthens it. This is exaggerated in my drawing, below. I'll also link to the die calibration templates I've put up before. Print one, cut it out and stick it down by wetting it with a little oil. Put a registration mark on the die body with a Sharpie and use the scale to adjust the die any specific amount you want to.
Die Adjustment Template