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I use a Sinclair Concentricity Gauge on Nathan's recommendation. The case sits on top of two pairs of ball bearings for support & is simple & accurate. Really happy with it.

I ordered the unit from the states. here's the link to a Youtube promotional clip;

https://www.youtube.com/watch?v=HTkjkhKoE9U

I looked at the design of the Hornaday unit & thought it was poor. I could see how it could give you errors & be miss leading as it relies on the base of the case being true from memory... not the smartest design in my view.

Cheers,

Jon

Hi Ben have you thought of making one. have a look at http://www.ballisticstudies.com/Resources/Discussion+Forums/x_forum/18/thread/4476.html