I too would like to add a bit of info concerning my own Trail Boss experiences.
I found a nice fit for TB, I load 6.2 gr of it in my 44 Mag, with a 240 gr Speer swaged bullet. I was using other powders but could not find a combo that didn't lead the barrel or the forcing cone, or both. I resorted to lubing them with LEE Liquid Alox for an improvement with barrel leading but the forcing cone was still heavily sprayed with lead. My theory for this was that the pressure was too low during the time that the bullet was travelling out of the cylinder and if the powder charge was increased, velocity would increase to or past the barrel leading threshold.
Trail Boss has enough pressure to obturate the 240 Speer in the throat without driving it too fast in the barrel.
Lubing the Speer bullet and using Trail Boss, created a working combination.
I also tried lubing the Speer in my Lyman 450, with equally good or perhaps marginally better results. The LEE lube is easier and quicker.
I tried Red Dot and WW 231 at various levels but was unable to better the performance (leading) of the Speer 240 SWC swaged. WW 231 worked better than Red Dot.
I tested in 2 different original Vaqueros, with good results. I'm finding it hard to have one load that will work in both, throats vary by about 0.002".