From the RCBS RELOADING DIES instructions:
"CARBIDE SIZER DIE
...When using a Carbide Sizer Die, it is not necessary to lubricate a pistol straight-wall case. However, the 30M1 Carbine is heavy-walled, tapered, and must have some lubrication. The .500 S&W and .480 S&W need occasional lubrication as well. We recommend lightly lubricating ever fourth or fifth case for best results..."
I think they meant to say .480 Ruger. I follow the above instructions for .500 S&W and .480 Ruger. I use RCBS lube. I haven't had a problem with other handgun cases in Carbide Dies.