For a case lube, what you are looking at is a lube that has a high film strength. Something like STP, lanolin , Mink Oil, any heavy wax type lube.
Gun oil is NOT sutiable for case lube, it will fail and you will have stuck cases.
The Mink Oil or any wax type lube is easier o use and comes off the cases.
The lanolin/alcohol mix will work well but you have to spray it on then let the alcohol evaporate.
Lastly get a nylon/plastic bore brush for cleaning the case necks. The brushing thakes out some of the carbon and makes it easier pulling the neck over the expanding button.