"There used to be a stainless lube available"
I e-mailed them years ago about their RIG +P Stainless Steel Lubricant. The answer was "yes", it's as good a rust preventer as the regular RIG. I've used the regular Rig as a lube, but not for any extended, heavy firing like you'd do in a weekend class. I think it'd be okay, but I dunno for sure.
I keep my dirtiest Rig Rag in my range bag to wipe fingerprints off before I head home. I keep a clean one, or at least cleaner one, to wipe down the guns after I clean them because the dirty one is loaded up with unburned powder, grit and general crud. Woolite will clean them.
I don't slather Rig on like cosmoline on a milsurp, just a quick wipedown to erase the fingerprints. It doesn't run like oil, stink like some oils or evaporate if the gun ends up sitting in the back of the safe for some reason. And the RigRag quickly gets into all of the nooks and crannies like lettering and serrations.
John