All the data I find is pretty old, and it all seems to be using the same statistical data. Here is a sample:
http://www.ojp.gov/bjs/pub/pdf/guic.pdf
We have to always keep in mind the trends on firearms.
20 years ago, a 70’s model car was most driven, today it is not for obvious reasons, th same hold true for these statistics, I doubt they are even close to being accurate, but do take note of the trend towards larger calibers over time.
—IIRC, Neal Knox pointed out about thirty years ago that the publicity given criminals and the type of fiearms that they use, along with ban attempts, cause an upgrading, as it were, in the type of firearm used in crime-—