I thought that the small pots of grease found in DR cases were just for lubricating the hinge pins etc. I would have thought that if it as destined for covering all metal parts for corrosion protection, the pots would be bigger and it would be difficult to evenly coat the bores with vaseline in any case (and if you were using oil for corrosion protection of the bores then why not on the outside of the barrels?). There was a long discussion of the best types of gun grease for lubricating hinge pins here http://forums.nitroexpress.com/showflat.php?Cat=0&Number=21207&page=0&fpart=1&vc=1 with a technical explanation from BigRx.