Push the spent primer out of the case before attempting to trim it. The little pin on the end of the "case gauge" has to protrude through the primer hole and actually touch the face of the lock stud once it has cut the case to length.
Also, you may want to brush up on reading your dial calipers. Your case is a smidge under 2.045" as your calipers in the 1st pic are reading 2.042" .
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