Before i saw the light and did forsake the fad stuff and start shooting the real true Gun]Powder I will freely admit I did use a lot of Trail Boss.
But, and there is always a but, it takes a learning curve to get it to meter properly. At least that was my experience using a Dillon 550B. It seems to go through the measure like slowly falling snow, which we do not have in this part of Texas, however that is what I have been told by people that survive in country where it does snow.
It does measure very exactly once you find the rhythm and is almost impossible to double charge and least in .45 Colt and .45 Cowboy Special cases.
It is a good powder, but you may wind up with lddy biddy grey cherrios all over the bench.
Yr' Obt' Svt'
Bunk