I think that squares very completely with reality. If I remember the 1967 Bonnie and Clyde movie I think the gunshot scene went on for a couple of minutes. I really do believe they were shot with thousands and thousands of rounds.
It says law enforcement fired 160 rounds into Bonnie and Clyde's car. Another website said 130, and yet another one simply said "over 100." Whatever the actual number, the pictures tell the story... I wouldn't have wanted to be on the receiving end!