Has anyone worked up load data for the .450-400 using pistol bullets and Trial Boss powder? Seems like it would be a neat way to do some cheap plinking with the big gun, or maybe shoot some hogs without using full power loads.

I have a box of those bullets but I have never used them. Instead for my 40-65 Single shot I use cast bullets that weight anywhere from 325 grains to 410 grains with a moderate load of SR4759 for about 1100. I get remarkable accuracy from the 325 grn gas check bullets.