For years I've been jealously guarding a small stash of Winchester RA9TA (127 gr +P+ T-Series) but started considering alternatives because those can be really difficult to find sometimes (I've gone years in between finding them in stock). Lately, I've become pretty enamored with Federal's 9BPLE (115 gr +P+ Hi Shok).
While I'd pretty much written off fast 115's years ago for lack of penetration, these actually seem to make 12" fairly reliably (with some fragmentation, but as long as penetration is good I don't care).
https://www.youtube.com/watch?v=ITIFDTRWz0c
https://www.youtube.com/watch?v=W9iiaXoRaRY
Also, I'm currently able to order this stuff for $18/50 rounds, so I can afford to stock up and have a decent stash. Finally a lot of police agencies (the IL State Police probably being the most prominent) were very satisfied with this loading for many years, so it's well-liked by many who have "seen the elephant."