Caster oil.
I read an article about it in a model airplane magazine the other day.
Caster oil, is the primary oil used in 2 stroke engines.
It has a very high flash tempature, so it does not burn well.
It is wetting, so it coats cyl walls well.
Under heat and pressuer, it forms large polymer molecules, so it fills gaps in piston rings.
It seems to me that a bullet and a gun barrel is about the same as a piston in a cylinder..
Hs anyone tried caster oil as a bullet lube ?
Say maybe , caster oil plus bee wax, or with carnuba wax, or... ?