I really think the whole "floating bolt head" thing borders on being a myth. Two Savages I have in the shop have bolt heads which fit so tightly in the bolt bodies that there is no float whatsoever. Regarding the barrel nut: the nut just provides another opportunity to produce a thread with a poor fit or a mating surface with partial contact. The real lesson to be learned is that maybe things just don't matter as much as we like to think. WH
I have similar feelings as well. I have the tools the true the receiver to the bolt raceway but no way to square the face of a factory barrel nut, which all of my rifles still use, and I can not see it’s effect on the accuracy of these rifles.