If you are shooting handloads..
Some folks do not know that a 223 seater die may have a crimp function built in,and if you run the die in the press to touch off on the shellholder,you may be applying a maximum amount of crimp to your round
This can increase the dia at the shoulder as the case collapses a bit.It can also increase the dia at the neck.
As the bumped up dia's are forced into a tapered chamber,things can get stuck.
Try measuring these dia's against the drawings in your loading manual.Also,try backing your seater die out about the thickness of a penny.
Some folks do not know that a 223 seater die may have a crimp function built in,and if you run the die in the press to touch off on the shellholder,you may be applying a maximum amount of crimp to your round
This can increase the dia at the shoulder as the case collapses a bit.It can also increase the dia at the neck.
As the bumped up dia's are forced into a tapered chamber,things can get stuck.
Try measuring these dia's against the drawings in your loading manual.Also,try backing your seater die out about the thickness of a penny.