One thing I saw at the DD shoot is that most people don't know their rifles trajectory. The 10mm targets at 9 and 10m cuaght most people out purely because they don't know where their rifle shoots.
Here in Natal some of our targets are at 8m , shoot it through a brick or an old tyre , while standing ! It builds character , & these close ones are often missed . You kinda get slack , " oh its so close , just point & squeeze " " F*#@% Missed ! ? ! ? " Makes you think , does'nt it !