ThanksIf you are asking which to use, I have had good results with the Forster Datum Dial. Thanks, Steve
This is the kind of precision needed to make them interchangeable, and most would be unwilling to pay the price for that level of precision, especially for multiple inserts.I have the Hornady kit, less than impressed. I've given some thought to making my own insert bushings. The holes would be reamed and then honed to a specific size and the faces would be exactly square to the hole centerline with no edge break unless I can figure out how to precisely and consistently create a .005" radius that is economical to do.
I doubt that I'd make them from aluminum. 17-4 PH or lightly hardened A2 would be my initial choices for metal.
I use Sinclair for Headspace and Hornady; for Stoney Point style measure of maximum CBTO and to setup seating dies for CBTO. Good points made regarding Hornady aluminum bushings! You must use the same bushing for all CBTO measurements to have meaningful comparisons.This is the kind of precision needed to make them interchangeable, and most would be unwilling to pay the price for that level of precision, especially for multiple inserts.
Sounds like you've given this some thought. Great ideas!
Probably enough to destroy the calipersHow much pressure does it take on the calipers to deform the aluminum Hornady comparator to make it useless?