A friend and I were discussing forensics and .22 caliber rimfire. I have heard over the years that .22 caliber rimfire, mostly because the bullets are soft lead and are more prone to deformation and disentergration, aren't as easily matched to barrels forensically as opposed to copper clad bullets which are far more apt to leave marks that can be matched to a barrel more conclusively. Is there truth to this? What about chamber/extractor/ejector markings on spent .22 caliber rimfire brass?