How about what people really carried? Mostly solid frame and breaktop .32 or .38 S&W DA revolvers. Auto pistols were somewhat "exotic" and featured in the movies, but were not fully trusted and very few people carried them.
Law enforcement officers mostly carried Colts, like the Police Positive for uniformed police or short barrel versions of the New Police or the early Detective Special for plain-clothes officers. Among police, S&W's were common in the south, but so rare in the north that the Mason-Dixon line was sometimes called the Smith and Wesson line.
In the west, many LE officers still carried SA Colts, or guns of that era; some carried .45 autos. Otherwise, a few police or federal agents carried .45 autos, as did crooks, but they were not common among the citizens, being mostly considered an "army gun" and too big and heavy.
Surprisingly, a fairly common gun for those who could afford it and had a taste for the esoteric, was the Luger, which was being imported by Stoeger and which had been a favorite "bring back" in WWI.
Jim