[Brian Pfleuger]

I think he means that the point that they lose the lubricity is below 10,000, like 6 or 8,000, for example.

I'm pretty sure he's wrong about it not increasing bolt thrust. I fireformed some cases in my 243AI and I still had some oil in the chamber. The extractor marks were scary and went away completely as soon as the oil was removed.

I've heard his theory in several places but I'm not convinced it's true and my experience tells me it's not.

I think the best way to fireform cases is to jam the bullet in the lands, which forces the head against the breach, and use starting loads or loads that generate at least 30,000psi, as appropriate for the cartridge.