At least two gunmakers, Thompson Center and Caywood, go out of their way to discuss removing all petroleum base products from the barrels, and "seasoning" them with one or the other supposedly organic lube/bore cleaner. They describe the process as "lube soaking into the pores of the metal. . . like seasoning cast iron"
I would more tend to believe this if they avoided the pure B-- S--- term "pores of the metal" Steel does not have "pores" Grey Cast Iron does have thousands of little slits, so to speak, on the surface where graphite flakes were, and these areas do indeed hold oil. One reason grey iron made good cylinder bores for internal combustion machines.
But steel is solid, without a @!*% pore in it, or on the surface.
I am aware that various chemicals do bond to the metal surface, machining oils being one example. Good sulphurized, chlorine bearing machine oil can lower the shear stress required to cut, just as it touches a freshly cut surface. I use this just as one example of oils interacting with steel.
So, does anyone have believeable experience with the use of inorganic, e.g. T/C bore butter or Old Swamp Hunter Lube, lubes & cleaners versus "petroleum base" products?
This being with respect to accumulation of fouling in the bore.
Or, are any of you guys chemists enough to discuss the matter in technical terms? Me, I am a mere metallurgist.