The Hornady tool is 5/16"x36 tpi. According to the table I have, it takes a 7.3mm drill for that tap. You can get a set at Amazon...
https://www.amazon.com/gp/aw/reviews/B0195UFBUY
Some of the reviews for this tap/drill set say they buyer used it for making their own cases for the Hornday/Stoney Point OAL gauge.
https://www.amazon.com/gp/aw/reviews/B0195UFBUY
Some of the reviews for this tap/drill set say they buyer used it for making their own cases for the Hornday/Stoney Point OAL gauge.
I refuse to be victimized by notions of virtuous behavior.

