No filler with Trail Boss.
The recoil with TB should be light enough that you should be able to get away with just a very light crimp.
I use Universal in my .45 Long loads for my Smith & Wesson revolver. It's a pretty stout load, but I only use a relatively minor amount of crimp and I don't have problems with bullet set back.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.