Some bad info had been added above a few posts back, don't pull your barrel to clean it, it isn't necessary. Heavy duty solvents aren't necessary to clean oil out of your bore, a dry patch should do it, soap and water will work just fine if a dry patch doesn't get it all. AND if your cleaning jag won't make to your breech face your gun has something seriously wrong going on in the way the liner was put in, I suspect your cleaning patch will clean to the breechplug without a problem.
WD-40 is a pretty good solvent as well if you want to run a patch or two down the bore to make sure you don't have any accumulated crud in the bore which I would bet that you don't.
I think you are over thinking this petroleum use stuff, oil is oil, a little isn't going to hurt anything.
I to am a Barricade fan for a final coat after I clean and dry the bore of my rifles, that stuff works, no little brown streaks on a first patch months later if you use it.