Gathering items for 480 Ruger loads. Lee doesn't have an off the shelf sizer for .475 bullets so I have to order a custom die. What has been the diameter of the new Bisley Blackhawk barrels in 480 Ruger? I can order in any size I need. It seems strange that for as long as the 475 Linebaugh and 480 Ruger have been available that they don't have this size.