well, yes and no imo. the easy one first. micrometers have a slip clutch, calipers (at least mine) do not have the same feel. micrometers have inline force, whereas calipers jaws act as a lever and readings 'can' be manipulated by closing speed/force if not careful.
now, seaters. my wilson inline drift does not always play well with some bullets designs (not talking about vld's even). if i get too much neck tension, some bullets (typically light jacket varmint bullets) will leave an impression where the contact is made. the mechanical advantage of the drift on the sloped surface of the ogive will amplify the inconsistent seating depth.
i like boyd allen's mention to seat all long, sort, then tweak. of course comp br shooters are not going to be deforming their bullets in the first case...
and finally, 243win's post about controlling start pressure by always have the entire bullet contact area in the neck turned on a light bulb for me. i have struggled with short light bullets in long factory freebores not sealing. Aha!
hope this is helpful in some way.
