Thread: Fl sizer not sizing the neck?

I have a set of 6.5x55 dies, I think they are rcbs, and for the life of me I can't work out why the cases I run through them won't hold the projectiles. There is almost no neck tension, to the point where I can gently push the loaded bullet into the bench and the projectiles just slides deeper into the case. I've never run into this before, and I've tried setting up the die again but it doesn't work. It does the same thing with virgin Norma brass, as well as once fired S and B ammo. I've loaded for dozens of rifle calibres over the years and this is the first time I've had this. Any thoughts?