I use a lot of Trail Boss. My wife, my daughter, and I all shoot SASS Cowboy Action. I just got finished loading all 4000 of our .38 Special brass with Trail Boss. We shoot that from our revolvers and Marlin 1894C's. I also use it to load .44 Specials for my Wild Bunch 1894. Before we moved to all Marlins, I've used it in Rossi 92 rifles and carbines in .38/357 and .44. I still have those for backups.
I use Trail Boss in my original 1894 Marlin (1895) and my original 1892 Winchester (1910), my pair of S&W 1905's in .32-20 (1907 & 1909) and in my S&W Safety Hammerless in .38 S&W (1895).
Trail Boss is a lot more versatile powder than a lot of folks think. There is a data sheet from IMR, who originally developed Trail Boss, that tells how to make up a load for anything you want to shoot. There is a link to the sheet below. It's worth taking a look at.
Trail Boss Data Sheet
Threaded Mode