Station #1 or #2 can cause the problem. In station #1 it would be caused by the machine not going to the top of its stroke with the shell remaining part way in the resize collet preventing the carrier from indexing. Another cause can be the primer not being fully inserted. If you can see that station #1 is not causing the problem, remove the primer seating assembly described earlier, drop the shell out the bottom and look if the primer is fully seated. If not, the problem is usually caused by foreign material (powder) in the primer seat assembly, or the tube not being adjusted low enough to push the primer all the way in. At times, oversize primers can cause the problem, but this can almost always be overcome by lowering the tube a little.
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