Myth – “Practice makes perfect”
Fact – Practice makes permanent
If a shooter practices a poor technique, or practices it inconsistently, the shooter will not improve his ability to shoot. More of the same can never improve things. Good marksmanship involves programming a series of conditioned reflexes, some of which are contradictory to natural human response. Shooting more, but failing to develop certain specific reflexes and removing others (flinch), will only condition the shooter to stumble along at a lousy level.
It isn’t like physical training, where simply pounding out repetitions will probably yield some gains. A person could expend 100 rounds a day for years and possibly never improve his ability to shoot.