Re: bet on bullet comaparitor being the same
the short answer is: not likely. the ogive is not a fixed point in any sense. it is in fact "The pointed, curved nose of a bullet". the ogive is the entire section between the full caliber shank and the meplat. as such, most comparators measure to a nondescript "datum point". the diameter of that datum point will vary greatly from the diameter of the throat of your rifle. thus the comparator measurement you get for a specific bullet is not the actual distance to your lands but rather a relative distance. since the datum diameter's location on the length of the ogive is different for every make of bullet, and that diameter has no actual relationship to your lands, it is highly improbable that both bullets seated to the same comparator measurement would have the same actual distance to the lands.
here is an easy test. use a magic marker to blacken a bullet, then seat that bullet in an empty case so that you know it will seat well into the lands (just seat it long and push the bullet into the case the rest of the way with the bolt). upon extraction of said test round from the rifle you will notice the lands have worn of some of the black marker where they touched. now take out your comparator bushing and put it on the bullet. if it touches at the exact same place as the worn off marker, then don't ever sell it because you have found the holy grail of comparators. if not, then i rest my case and you have lost your bet.