This kind of analysis doesn't make sense to me.
If you have a right to use deadly force, it doesn't make any difference "how deadly" the force is. If the bad guy was properly killed, it makes no difference if the gun used in defense was a .22 or a .50, whether the bullet was factory or handloaded.
I have seen no cases or news reports of self-defence shooters convicted or found liable for using, for example, a 10mm instead of a .22.
What you are more likely to see are cases in which the shooter fired accidentally, or fired when he thought there was a threat but there wasn't any, or when someone used a handgun when there was no imminent threat of DEADLY force being used against him or others in his presence.
The questions are whether the shooter was reasonably in fear for his life or for the life of another and whether the force used was necessary and appropriate to end the threat.
All handguns are deadly. All bullets fired from handguns are deadly. So it makes no difference what pistol or round you use, if the other factors are established. At any rate, the chance that a civilian will intentionally fire his handgun to shoot someone is extremely remote, so I wouldn't choose a handgun or round based on speculation about what might happen in court. Even policemen very rarely fire their handguns away from the range. So you should select what will be effective in a self-defense situation, not what some plaintiff's lawyer or prosecutor might make of it.
I have a law degree, I taught legal research and performed legal research for over 20 years, but I am not a practicing attorney. No one should rely on my statements or those of others without consulting a competent lawyer who is familiar with the relevant state statutes and cases.
Drakejake