I look at that plastic skirt as functionally nothing more than a patch used as a wad with the exception of being semi attached to the bullet. They do fly well out of my 50 cal TC, load easily but at least IMO don't perform on game as well as a saboted Barnes which load really hard out of my 50 cal. My problem using them for hunting is the difficulty of reloading in the field if needed. If I foul a barrel then load for the hunt that 3rd load if necessary is hard.