Interesting thread. I have been using TG for .45 & .38 special. My preference for any of my shooting is light loads that are accurate - not interested in PF.
To me means no worse than 1.5" at 50 feet off a rest, which ain't awesome but its ok. With .45 acp & .38 spl I can do that, but struggle with 9mm and cast bullets or PC'ed. Its acceptable as hitting a 6" circle buts that it. My fairly extensive testing at many charges has not given me any encouragement, and I too have seen key-holes in addition to wide groups. Plated gives me 'best' consistency.
I recently started trying PC bullets and noticed increased pressure for the powder charge as plated - very snappy. Wondering if that is expected or not.