There are many things that factor in on this question, so there is no set answer; however, as a general rule, most permenant wound cavities are LARGER than the bullet diameter.
I know there are many that will "say it aint so" , to these I suggest you consult a forensic expert or trauma surgeon before disagreeing. After assisting with MANY autopsies and digging MANY bullets out of people, I've seen this first hand with multiple calibers including rifles and handguns.
Doc
(for those that haven't done the math, it's not just a nickname)
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