Between the introduction of revolvers in the middle 1830’s to the middle 1920’s I think it was more common to point rather then aim during a defensive shooting. I base this observation on extensive handling of handguns from this era, and noticing that the sights were both primitive and very small. If one tried to quickly pick up any kind of a sight picture – especially in low light conditions – the fight might be over before they got started. Given this, a tendency to “point lower,” rather then higher might be expected. Also horrendous trigger pulls, necessary to insure ignition, could contribute to low shots.