There are many ways to improve one’s marksmanship skills, however some efforts also carry the “excess baggage” of inadvertently creating poor tactical habits and detrimental gun handling skills.
In my youth nearly all the police officers I ran into carried a revolver, the vast majority of them a .38 or .357 Magnum revolver. My uncle was a police officer in Colorado and his was the first magnum revolver I recall seeing.
You may have never heard of J.H. FitzGerald, but if you are a handgunner then you probably owe more to him that you think.