My patch lube is 50/50 BB and Crisco.
It allows 25 shots (and more) w/o wiping.
But the point here is that it does no harm to any of the metal work on or in the rifle.
I clean after shooting with plain water with a dot of liquid soap in it.
Then dry and oil with what ever I happen to have avail.
Sometimes 3n1. Last time it was a Hoppes oil. CLP I use also.
The F/Lock gets pulled and washed with the same water, brushed and wiped clean and dried.
I wipe it down a bit with a cloth that has some of the 'oil of the day' on it and reassemble to the rifle.
The lock is all high polished steel,,no extra protective finish to it.
Never a rust problem.
No rust in the bore but I always check and recheck the bore the following days after shooting.
to be sure.
It's humid and hot here in the NE during summer. Gotta watch those things.
FWIW,,3n1 oil is just 'Spindle Oil' . A type of mineral oil.
The older 3n1 used to be nothing more than straight weight 20 or 30w oil and said so right on the little bottle. I still have some of that around.
The proprietary gun oil from the mfg'rs like Ithaca, Parker, etc that they used to sell or sometimes provide in the small metal cans with their names on them were nothing but 20 or 30W oil filled from 55g drums into those little cans by usually women or children at the gun factorys.
Nothing wrong with that. Nothing magic needed. Just oil and some attention to the metal after shooting.
Removing the rust forming compounds that the BP fouling leaves behind is the most important part of the rust prevention.
Oil won't do that for you.
Plain water will.
Then the oil or grease prevention coating to the metal surface.
Ballistol is Mineral oil as well with some alchohol in it.