I'm not quite as hollow point, expanding bullet oriented as most are and have carried 230 grain round nose FMJ in the .45 ACP. I can only base my experience on various critters shot with non-expanding .45 ACP bullets, but all tended to go down for the count and stay shot with any kind of a decent hit at all. I'd feel very confident with a .45 auto loaded with military ball equivalent ammunition.
The expanding FMJ idea has merit.
It would be difficult and perhaps pointless to determine which is the best and which is the worst 230 grain FMJ ammunition among the choices marketed by ammo makers. As long as it is sure-fire and attains velocities that approximate military spec. ammunition then all FMJ ammunition is pretty much the same and will give the same function in the pistol and the same terminal ballistic performance. Another way of looking at it is that any assailant could be said to be having a bad day if fairly struck with the worst 230 grain FMJ ammunition on the market.
"I prefer a FMJ round because I want to be as certain as possible that the BG I shoot has two, and not one hole in him so he will have a better chance of bleeding out before an ambulance can arrive."
I'm also not too wrapped up in the notion that one must promote expansion due to over-penetration worries, but an anticipated exit hole isn't the complete answer to an effective stop either. It is certain that spending much time at all dwelling on the relative chances of bad guys bleeding out before an ambulance can arrive smacks of unnecessary callousness and exhibits a bloodthirsty mind set in dealing with an assailant. By all means, have a mindset to prevail and an effective stop is needed, but being desirous of someone's lifeblood ebbing out before help can arrive isn't part of the self-defense equation.