Have not tried TB, I have a bunch of Nitro 100, AA2, AA5, AA7, and 2400 around the house. Given the data that I can find the only way I will be able to get to original 44-40 velocities is using holy black. I have schuetzen 2F and 3F and Olde Eynsford 1.5 and 2F
Reading through a lot of stuff on the CAS City Forums sounds like the best bet for fouling will be the OE vs Schuetzen. I am basically too cheap to come of the dime for swiss and the OE seems to be within a gnats behind of the quality of the swiss.
Don't know if I will ever hunt with the 44-40 because it is really hard to get drawn for a hunt here in AZ. Having said that there is some discussion of a Hog hunt in conjunction with the SASS Convention in San Antonio 7-11 Jan or there abouts. There will then be the 73 44-40, 92 44 mag (carbine and rifle), 94 32 WS (dads rifle and sentimental favorite) 95 30-06 conundrum.