Black powder lubed bullets over smokeless?

[Bill in Oregon]

I have used cast bullets lubed with both SPG and home-made Matthews lube over smokeless powder in handguns and carbines without noticing any increase in leading, but I haven't shot very many rounds loaded this way, nor made a serious study of the matter.
My guess is that if one pushed cast to the higher velocities-- say 1500-1800 fps -- that the favored smokeless lubes will provide more protection from leading. Anyone looked into this closely?

[JB]

I'm thinking maybe or maybe not. There's a lot of bullet lubes out there including dozens if not hundreds of homemade mixes. I'd think not all lubes act the same, so it's hard to tell without a ton of testing.

[earlmck]

No I can't help you there Bill. I like the "smokeless" lubes because they are less messy to handle. I'd put my money on the SPG being the equal to the smokeless lubes (as far as leading protection goes) even at velocity. But I have not ever tested the thought -- I just have so much of the LBT Blue lube and it is loaded in my Star where everything is sized except for the buffalo gun stuff. I have an old Lyman sizer loaded up with homemade BP lube and that takes care of those BP bullets.

Many years ago when I considered switching from the Alox/beeswax lube to the heated waxy lubes I did a little testing and decided the waxy lube (the LBT Blue) gave better accuracy. Leading was not a problem with either lube. Made the switch, which necessarily included adding a heat plate to my lube-sizer, and have never looked back.