Most of y'all may already have found this out, but it just dawned on me to try it! I was sizing some PC'd 125 grain rn boolits from 360ish to 357, and it took a pretty good pull of the handle to run 'em through a Lee sizing die. I looked around and spied a tube of Lee brass resizing lube on my bench, so I put just a very small dab in a plastic tub, gave 'em a swirl, and there was a very noticeable decrease in pressure needed to size 'em down. Also, the Lee lube dries to just a haze.
Thought I'd pass it along to those who may want to give it a try.