This group buy is being hosted over on the Single Actions forum (LINK)
MiHec 477640 Light 2 Cavity Brass Cramer Plain Base mold in Hollow Point.
This is a new boolit design, a little brother to the already done 385 gr. HP. This will be suitable for the 480 Ruger or the 475 Linebaugh handguns or rifles. It will cast at about 0.4775" to .478" dependent on your alloy. The weight is as shown on the drawing dependent on your alloy of choice. Meplat to crimp = 0.367".
Again, you'll have to sign up over yonder to get in on this group buy. They're looking for 15 for it to go.