I have a couple tubes of the 105 in my cabinet. I use it for many things, guns included. I have a wee grease gun that screws onto the tube. 105 is the nuts for outboard lower gears too.
A long time ago I had a friend rebuild a Ford Falcon engine, and he wiped the bearing shells with 105. When they fired the engine there was a problem with the oil pump and it ran for some time with no oil pressure.
They sold the car with 90K on the rebuilt engine.
I also love the Lubriplate Brake-Lube. Better than the lithium. I use it on break gun hinges, among other things. Mil-Tec is good stuff too.
I have used it, plus all kinds of other greases. However today I use nothing but Rem-oil on everything! My train of thought is, grease in uses like gear lube where heat and or high rpm's are the norm. I use a light coat of oil, clean the gun after use and re-oil. I truly believe that this is the only lubrication needed for any firearm. Think about it!
I used white lithium grease on my Browning XT for about a season of trapshooting. The only problem I noticed was it seemed like the screw-in Invector Plus choke tubes would be hard to remove after firing several rounds of trap on a hot day (I lubed the tubes with the lithium grease, as well as the action of the gun).
I was concerned that the choke tubes would eventually seize, so I quit using the lithium grease on them.
I found lubriplate in a small 1.75 ounce toothpaste tube style container at the hardware store. Very convienient. A couple of tiny drops, shoot the weekend, and wipe it off before I put the gun in the safe. Seems to do the job fine.
I bought 3 tubes at least 5 years ago, I still have not opened two of them.
I do not think the type of lube on a break open gun is all that critical. As long as there is some lube there, and it is kept clean, the gun is protected. I have used a drop of motor oil off the end of the cars dipstick before in a pinch. Sounds crude, but it is better than no lube at all, especially on a stiff gun.
Know this is a little off topic but I gave up oiling my target & hunting guns and now use Renaissance wax (synthetic wax, museum quality and developed in the UK) on all my gun metal surfaces. It can even be used on wood. It does not collect dust and all I have to do after shooting is wipe the metal down with a clean cloth. Never had a rust problem using it. A small can will last a long time.