Once you install the body on your calipers and install the headspace/bullet comparator you close and zero the calipers correct? Is the edge that touches the datum on the shoulder flush with the face of the insert? Or is it recessed into the insert. Same with bullet comparator. I'm just curious if once you zero the calipers it's a true zero to where the case or bullet is touching and measured. Do the Sinclair inserts give a better feel than the aluminum Hornady inserts? I'm using a RCBS case mic but wanting something I don't have to screw/unscrew. Thanks for looking.