I wouldn,t want any gun with excessive headspace,even if my insurance was paid up! Rebel hog and others defined it very precise.One other factor comes into play ,and have seen it before.As all reamers are different,thus all chambers are different.Sometimes,through different manufactors the Headspace gauges can have fifferent dim..,thus will give a false reading.Not very often but if 4 guns from Rem or whom every are this way in the same shop,its a real bad bo bo by the quality control people or his headspace gauges may be off. vangunsmith