The darn caseings wont go in the bore if I seat a bullet in them. They will fit without the bullet though.

IF a resized case will go back into the rifle without a seated bullet, but NOT go back into the chamber fully after the bullet is seated, there are two possible causes that I can think of:

A. When you seat a bullet, the bullet is expanding the neck to a diameter that is too big to let the case neck back into the chamber neck. If this is happening, the case neck walls are too thick, and must be reduced in thickness with a neck turning tool. Here, I doubt that this is the cause, however.

B. The crimping shoulder in the die is trying to apply a crimp at the wrong place on the bullet as you seat the bullet. (Not where the canelure is located.) Since the neck brass has no place to go, it causes the shoulder of the case to buckle slightly, enlarging the diameter of the case at the junnction of the shoulder and body to the point that the case won't re-enter the chamber. Backing the seating die out a couple of turns before you seat a bullet, so the crimping shoulder won't touch the case, will cure this.

A similar shoulder-expanding problem can occur if you are loading a compressed load, when a powder charge expands the case shoulder when the bullet is seated, BUT since this case is empty, obviously this is not happening here.... I think it would be obvious to you if the seated bullet were sticking out too far, as there would be rifling marks on it when you extracted the dummy round. Or the bullet would be stuck in th rifling, and not come out with the case when you pulled it out.

I like the idea of making up a dummy round after you have developed a load, so your dies can be easily re-set to produce the same round again later. I have such dummies for almost all my die sets.