Never tried T-17 but I wouldn't be surprised if they're all made with pretty much the same ingredients nowadays...
I only use the "supposed" BP solvents to remove the initial fouling in my bore immediately after a shooting session and prior to a good flush/rinse/dry and then an alcohol rinse/dry and an application of Barricade.
Butch's does work well for wiping off small parts and the exterior of your barrel around the lock area as well. And, they state that it has protectant qualities. Whether that's true or not is beyond me, I have never just cleaned any of my BP firearms with it and then put them to bed.
I did notice that Butch's tends to "foam" as you pull it up and down the bore so maybe it's more of a soap based cleaner vs T/C 13 being more of an ammonia based cleaner like Windex, etc.
BPS
Last edited by Blackpowdersmoke; 01-14-2016 at 07:33 PM.