I want no part of oiled cartridges, and I don't like bullets contacting the lands when I chamber a round, Silly of me, but that's the way I am.
First, a question. Have you ACTUALLY checked the headspace on the rifle? Does it close on a no-go? Does it close on a field gage? If it closes on a field, I would set the barrel back and be done with it. If it closes on a no-go, try expanding the case necks to the next larger caliber, them resize in a properly adjusted sizing die, and set the shoulder back just enough to chamber. There, you have just adjusted the brass to the chamber length. You will still have a barrel with excessive headspace, but your brass will be adjusted to the excess length, effectively equaling a properly dimensioned chamber.