I've used the stuff that Dixie sold in the late 70's/early 80's labeled synthetic whale oil. Can't say about anything currently labeled as such. It was awful stuff, and thickened in even mildly cold weather (50's) which pure sperm whale oil doesn't due.
I've read on here that Jojoba oil is a substitute- I doubt it. Can't see how a tropical tree oil could compare to an oil from the head of a Sperm Whale any more than a "veggie" burger compares ground beef. I do have shaving soap that has Jojoba oil in it though!
I think a lot of the whale oil talk is do to the myth of the unobtainable. You would have to be at least in your sixties when it was readily sold. Trapping supply houses were the last places I remember seeing it. It is a great lock and barrel oil, but not any better than many other products sold today, and it's not a great patch lube, at least not from the continuous loading/no swabbing perspective.
It can't be sold nowadays, and even possessing a bottle can put you on the fast track to Felonyville.
Frankly, any of the good gun company oils work as advertised, just pick one and go with it. And Ballistol and Hoppe's products have been around more than a hundred years at this point.
Good statement AlanG. During the 60s I had a filling station and one of my good friends was an older man that worked on railroad switches. He brought me a small container of Whale sperm oil, They used it on some small moving parts, and knowing my interest in guns, he gave me a small bottle of it. I still have some of it, fact is a friend borrowed it from me a month ago to oil an old-time clock. He told me I was the only one he could imagine that would have any of it. I haven't used it for years, I think your statement on good gun company oils is very true so why get attached to something that there's not much of. When I was a lad we used kerosene for some of them old windup clocks and it worked reasonably well but wouldn't last a long time. We use it on guns that were left out in the cold as we didn't have access to the whale oil. I don't muzzleloader hunt in extreme conditions so there's not much danger, when you're 80 years old, that you need oil that won't freeze up, when it's 20 below. Anything below 20 above is too much for this lad anymore.
Squint