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This bullet measured at 9.3mm on the scout x-ray... that is 9mm deformed
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Don't be tempted to make calibre measurements from a CT scout or any other kind of diverging beam planar imaging such as plain films. You need quite a bit of prospective imaging to calculate the amount of magnification and then subtract it from the measurement. In tests I have done with inanimate 'subjects' and bullets fired in a homogenous medium, the results were not optimal, even though I employed the proper prospective imaging (a combination of plain film and CT on a purpose-built jig).
With a live patient and an asymmetrically-deformed and presented projectile, results will be sub-optimal before you even consider other confounding variables.