They shoot groups that have to be measured with a micrometer, so Wilson dies must be fine the way they are. You have to realize that Lapua brass, sorted and neck turned, sanded, doted over like a new puppy, fired in a precision chamber, and resized very little is not going to have the concentricity problems that mass-produced rifles and cheap brass have, so the lack of positive neck support matters not to a 6x45. Besides, you really cannot support the neck in a meaningful way when seating the bullet....even if you limit any off-center neck stretch as the bullet is seated, the spring will still be there when the cartridge is withdrawn from the die.