I'd not bump this thread, except that it involved catalog of firsthand experience with the 464. I've now had my 464 for 2yrs beyond the last post. Another couple hundred rounds in both range and field use and I've still not experienced a failure of any variety. In fact, I asked my local gun store (where I purchased) and he's sold plenty with no returns per defects or malfunction.
I've since moved beyond the Hornady Leverevolution ammo and currently fire Winchester Supreme Silver (Round Nose) Ballistic Tip. I made the switch because the terminal performance of the LeverEvolution was not conclusive as I've had with the CT bullets.