Like you were saying about a wadcutter, I've always leaned toward the widest, flattest, sharpest meplat that still feeds reliably, and assume it's the least likely shape to deflect off anything. I'm just basing that on what most handgun hunters seem to think works best for killing big animals (that combined with heavy for caliber bullets).That 275gr looks pretty good.
The newer Underwood 9mm looks decent as well.
If I could find a 9mm bullet with that 275s shape, that's probably what I'd use. That Underwood is about the closest I've seen anyone get, other than the 135 Ranch Dog. I'd think a 155 to 160 might work really well too. A 170 in 9mm would actually be the scaled down 9mm version of that 275 in a 45 ACP, but that's getting out there.