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THANK YOU thats what I will doMake your own. You'll need a case fired in your chamber, 5/16-36 Tap, 9/32 drill, drill press, and a little cutting fluid. The tap and tap drill combo should cost less than $20 and be available at your local machine tool supply house.
http://www.longrangehunting.com/forums/f23/hornady-oal-guage-5-16-36-tap-56088/index2.html
I think I'm going to try to do it but THANK YOU!!i will make one for you if you send me a cple brass.
let me know