12fv308-Let me put this out first-As a 42 yr LEO/US Army MPI School Distinguished Grad/ Mil Police and State Police Officer for 21.5 yrs- ANY CSI TV show is so far beyond the pale of real police work that it makes Bullcrap look like honey! This all Hollywood BS! FYI-I worked UC in a foreign country under cover for Naval Intelligence(NCIS)-the TV show is puke!
Now for your post- Rem did offer at one time .30 cal sabots carrying .224 bullets @ hyper velocities. I even know of one murder where such a round was used, but "real world invesigation" caught the killer. Velocities in excess of 4000 fps were claimed for some calibers.