Well, ....what the heck. I've used bore butter, and I've used Ballistol. I have no bad thing to say about bore butter, I have just found Ballistol to be superior to everything else I've ever used, literally. It blends with water (where "MooseMilk" comes from!), and remains on the wood, leather, or steel after the water goes. Once I started with Ballistol-only on some guns, I noticed that those were the only ones that never had "residual rust" after cleaning and storage. So, now all guns, BP, centerfire, shotguns, all, get Ballistol. Non-petroleum. Been around for 110 years or so. And my uncle - Ballistol was all that could be found with his guns, in his tool shop, in his garage... Another thing - no need for a fouling shot, I've noticed --- it seems to have zero effect on point of impact. And that, interestingly enough, is also in the company's printed literature.
I still have bore butter and the T/C bore cleaner liquid, and bore butter coated patches, but I don't use them. I plan on giving them away if ever the opportunity arises that I meet up with someone that wants them. Yeah, Ballistol has a FAR less pleasing odor than the other stuff, but I kind of like it... but don't take that as a glowing testimonial, heck I even like skunk smell.
In case it needs to be said, I do NOT sell Ballistol, I do NOT represent that company or any of its subsidiaries, affiliates, or associates, nor am I in any way related to any of the above, that I know of. I just love the stuff. It is one product that, when they make a claim or claims, it absolutely does it and then some. And it'll even take rust off if left slathered on the barrel, so take that under consideration and use lightly on bluing. It also removes copper (dissolves it, they say) and leading QUITE well. Takes the mildew off leather, and (unlike petrol products) will not only not hurt the leather, AND wood, but it's actually good for both. One of my Marlin lever guns has only Ballistol as a wood "finish," although a finish it's not, more like a good preservative that doesn't leave a shine, but the water beads right up on.
Okay, I truly do apologize and in no way meant this as a plug for the stuff nor to "hijack" this thread, but it is after all the convert that sings loudest in church. Use Bore Butter, WD-40, Hoppe's, whatever works. But I highly recommend and strongly suggest the use of Ballistol on firearms, and most especially black powder, for which it was originally developed. If you order it from the U.S. distributor, be prepared for a poop-load of associated literature.