If I remember correctly, the FBI determined the average distance of a "gun fight" was 7 yards. However, I suspect they were using data from law enforcement shootings, which may not apply to a civilian exercising his right to self defense. Therefore, before an ideal distance is stated, one should consider what purpose the shooter is relating to. For instance, if one is considering handgun hunting for deer, a maximum of fifty yards seems to be an appropriate distance...but given some states requirement to retreat from a threat, fifty yards would not seem an appropriate distance for self defense practice. Or, in other words, seven yards.