"Why are you wasting time and money loading Trail Boss in these calibers?" quote.........

Maybe I use Trail Boss in my 357 Magnum with magnum cases
with a lead 158gr swc with a OAL of 1.59" since it............

gets better accuracy than any Bullseye, Red Dot. Green Dot or w231
for all the loads that I have tested for light target loads out of my two 6" revolvers.

It is also better than a lot of powders in my J frame 38 snub nose, with the 148 and 158 gr lead bullets.

In my last test it kicked the new powder, BE-86's butt, with
a lead 148 BBwc in starting and full charges.

I use any powder that is accurate..........
you worry about cost ?