[NIFT]

There is nothing inherenly wrong with very tight (same hole or ragged hole) groups, but that kind of accuracy requires both the shooter and the target to be motionless, which just ain't gonna happen in a deadly force encounter.

I have never been in a gunfight, hope I never am, and do everything in my power to avoid such, but, until it happens, I really don't know how good I would be. Who knows, I might not be able to be accurate enough to throw a bar of soap into a swimming pool!

Will accuracy decrease in a deadly force encounter? Almost assuredly and, likely, substantially. However, I do not believe concentrating on pin-point accuracy in a motionless range setting will do much in preparation for a deadly force encounter, if anything at all.
Force-on-force scenarios using simunition or airsoft appear to be the most realistic training, but few people can avail themselves of regular force-on-force training and practice.

Consequently, for range training with static targets, nine-inch paper plates with five-inch center circles, although limited, still work well.

Move, shoot, reload, go to cover, shoot, move, shoot some more, scream commands, change hands, shoot some more, transition to long gun, move, shoot some more, etc., etc., etc.. If you can keep all shots on nine-inch paper plates, with a large portion in the five-inch circle, that is a good protocol for static range training.

Just my opinion.