Back in the '90s, I had a .45 auto that was eating a steady diet of LSWC reloads. They were "Hard Cast", and had a blue lube on them that smelled like Crayons.
Like, three hundred or so a week. Sometimes more.
It wasn't BAD, but there was some leading.
I would clean it out religiously, and after a while I got a little tired of doing it.
So I went on a kick of looking for that secret sauce that would lube well enough to prevent leading and last for a whole day of shooting.
What I finally ended up doing was warming the barrel up in water, until the water just began to steam but not boiling.
Then, I dunked it in Mobil One synthetic oil.
The whole idea was that heating the barrel just shy of boiling was not enough heat to hurt anything (It was about the temp of a fresh cup of coffee) and applying the lube before it cooled would trap the lube in the steel's pores and make it stay there.
At the time, I believed that the synthetic oil had the smallest molecule available and was the best candidate for this trick.
I don't recall exactly what scientific testing methods I used to determine success on this one, but I remember believing that it did reduce the amount of lead that stuck to the barrel.
Who knows? Maybe it actually did.
The truth is that it didn't hurt anything, and I suppose it kept me entertained for a while.
Try it your self. It doesn't cost anything and it didn't take a lot of time.
And it just might be the excuse you need to play with your guns for a while.
Worse things have happened, right?