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On the topic of barrel lube. I have shot .38 wadcutters, home cast and lubed with a soft beeswa, based lube, until lube was dripping from the end of the barrel. No harm.

But it is not immovable like the recoil shield. I do not know about centerfire, but oil in the chamber of my .22 semi auto will cause jams.

flechero wrote:

hovercat wrote:Oil In the chamber is bad because the case cannot grip the chamber walls, in any firearm.

Shouldn't matter, as the cartridge being fired is back against the breech face. The seal is that of case expansion, achieved by chamber dimensions, not oil or a lack there of.

In revolvers, but the OP also mentioned semi-autos in his post.

Oil In the chamber is bad because the case cannot grip the chamber walls, in any firearm. For storage, oil can do no harm.
Oil in the barrel might affect accuracy in target shooting, but not enough for sd. In salty coastal areas, it may be a necessity.