Using the 185 TTSX I was .050 off with my Ruger and am waaaay off with the Kimber due to mag length restrictions. Both shoot well. Of those powders, I've only used 8208 with the 185 TTSX and really like it. I find 8208 and TAC both excellent. Probably a tad more velocity with TAC, but both comfortable in the low to mid 2700s. 8208 is supposedly extremely stable across temps, but TAC is supposedly good as well. My go to loads for each are 48gn 8208 and 48.5 TAC using 210 Fed primers and Fed brass. I've run them each higher but am comfortable where they are as far as velocity and they have been fired in high temps and fairly hot chambers with no pressure signs. Edit: those powder loads, while the OAL is different, work well is both my rifles. Oh, and your question about psi. The Barnes show less pressure than others I've found (I.e. 180 BT vs. 185 TTSX, the Barnes shows less psi signs at the same charge weight). Give yourself a buffer to work to 48ish.
