DIY Headspace Case Gauge September 24, 2010, 04:14:05 PM http://www.amazon.com/Hornady-Lock-Load-Headspace-Gauge/dp/B000PD5VN8I bought the set above from hornady after I had came up with using a spent 9mm case. I have been using the case just fine but figured since I was gander and they had the set on clearance I would get it. I came home today and checked and I got the same measurement using a spend 9mm case over a 6.5 creedmoor case. I will be reloading for other calibers later so the set was a good buy but however those people wanted to check the head space on a 6.5 creedmoor case new, fired and resized could do so with a spent 9mm case which is free at any range! it just so happens I switched from a 40 to a 9mm some time ago so I had plenty of spent cases. I'm betting you could do this with other calibers with the same 9mm or a 40 cal etc case but since after tax gander had the set for less than midwayusa and I wanted to see if it was the same. I got a paper weight right now since the 9mm case is actually faster and easier to use oh well another tool in the box right.