I have two molds for the .54 cal R*E*A*L bullet (two different weights......I think one is a 380 grain; can't remember what the other one is.)
What I've found is that they load fairly easily (I use bore butter as a lubricant) and go down a clean bore with just a push of the thumb. They are fairly accurate with lower powder charges, but when you want speed, accuracy seems to go all to hell.
.....and that's all I know about that!