It is very hard to tell since the thumb nuts are the culprit. You can run a test and it will turn out dif. everytime for a very good reason. Widage is affected by how much or little you thighten the thumb nut since the direction of force is from side to side. When you tighten them, the repeat of pressure can't be replicated accuratly by the hand. If you fixture a weapon in a vice and tighten thumb nuts and you use a red dot laser, you can see the laser wonder on a distant target as you tighten the nut. That is not practicle in the field, so you will always get a variation with any type thumb nuts due to the fact that a hand is not at the same exact strength each time, and can be wet from rain or persiration, or cold or hot, or from a dif. angle, many many variables. Ratchet knobs are a little better, but the trouble with ratchet knobs is that that ratcheting noise you hear is actually metal being worn, hence repeat is slowly lost and the side to side direction of variation in the direction of force can cause loss of zero as proven via laser aiming tests.
Jack