Marsh, I have the same problem with some of my bullets when sized to .476. I bought a .474 that RCBS sold, but my accuracy and velocity fell off. I will hone this out to make a custom fit die. This is fairly easy to do, all you need is a dowel, an electric drill, some sandpaper, and a good way to measure the die. If the link to the custom dies that 475/480 gave you doesn't look feasable give the honing a try. I did this on my 50-70 Contender, and it worked great. Good luck.