That's the Wilson case gage, probably. I use one for my .223 semi-auto reloading. The case is supposed to be above the lower cut and below the upper surface. (Between the surfaces)
Just checked my July Dillon. The Dillon case gages don't seem to be made with the same 'cut' as the Wilson. Looks like the head is flush on the Dillon gage.
[This message has been edited by WalterGAII (edited June 13, 2000).]
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