Hot take, most shooters won't do that consistently offhand on a square range, let alone under stress.
I don't think I've ever encountered a handgun that I really thought was not 3" mechanically accurate at 10 yards. Everything I own shoots to my ability on that given day and I've never felt held back by the mechanical accuracy of the gun. Trigger, yes, grip size, yes, caliber strength, yes, but never mechanical slop in the actual gun. Degradation in accuracy always seems to track well with my shot calling.
I don't think I've ever encountered a handgun that I really thought was not 3" mechanically accurate at 10 yards. Everything I own shoots to my ability on that given day and I've never felt held back by the mechanical accuracy of the gun. Trigger, yes, grip size, yes, caliber strength, yes, but never mechanical slop in the actual gun. Degradation in accuracy always seems to track well with my shot calling.