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"It is most probable that the bullet hit her head as she was falling down," said defence witness Roger Dixon, a qualified geologist.
He was under cross-examination by prosecutor Gerrie Nel.
On Wednesday, Dixon told the court he did not believe any of the four shots Pistorius fired could have missed her.
Other State witnesses had testified that three bullets struck her, but one of them caused two wounds.
According to Dixon, however, the first bullet struck her hip, the second struck her arm, the third her finger, and the fourth her head.
Pistorius seemed to battle to listen to the testimony on Steenkamp's wounds.
He once again sat with his head bowed and his hands over his head, with his thumbs pressed into his ears.
Pistorius shot Steenkamp through a locked bathroom door at his home in Pretoria on Valentine's Day last year.
He says he mistook her for an intruder and that the shooting was an accident.
He is charged with murdering her, and also faces three other charges of contravening the Firearms Control Act.
The State argues that he murdered Steenkamp following an argument.
