You might also want to visit the critical care unit (hospital) in your region, and camp out at the emergency room. When those bullets come out, you might be able to get some basic information from the doctor.
I doubt access to that sort of information will be so easy.
Another problem is that in most cases the “interesting” projectiles that are involved in serious injuries are removed in the operating room, not the emergency room. That’s either because of the condition of the patient or the location of the projectile.
My experience in South Africa is that despite the surgeons dealing with large numbers of gunshot wounds, they don’t (in general) have a good knowledgebase when it comes to identifying ammunition types and the components of cartridges. The same applies to radiologists and radiographs of projectile fragments.
To make matters worse, in many cases the projectile or a large part thereof has to be left in situ, either because of its location or because it cannot be located in the available time, or failure to extract for technical reasons.
In those cases you might get the required ID via X-ray or in some fortuitous circumstances you may find that a projectile fragment lodged in clothing and associated with the wound, can provide information that helps identify this projectile.
But…there are still unknowns to do with range, velocity, angle of impact, body position relative to the trajectory and also other little details such as whether the firearm and ammunition are standard or modified or even home-made.
And don’t forget the biggest stumbling block these days: medical ethics and patient confidentiality. If the hospital is doing its duty in terms of data protection and confidentiality, it is very difficult under layman’s credentials to access a body of data which has any meaning in terms of what you are looking for.
In my opinion, the types of data, access to those and physical presence in certain sensitive areas means it is only feasible under research conditions where you have a valid protocol and ethics clearance from whichever body has the powers to grant it, in that facility.
Don’t forget that clothing, imaging, projectile components, medical notes and recorded findings are all EVIDENCE. At least part of the information you are looking for, will be derived from handling the evidence or observing the evidence. Doing so in a manner that doesn’t compromise it and is not perceived as a risk to the facility can be quite tricky.