325's, whether wood or carbon, could do enormous damage if they struck a vulnerable area such as your neck. The chance for injury and death is there regardless of the models size when you've got pieces of wood or carbon spinning at 2000+ rpm.

If your neck happened to be directly in front of the point of release, you better have a damn good doctor on call.

I do agree though that the chances of "serious" injury are higher with larger blades that pack more inertia.