Check your primer pocket on your reloader for a piece of shot that may have fallen in. This is like resetting the depth of seating. More than likely you had a piece of shot that caused the primer to be set to deeply and got a poor strike from it. Some times they will ride out after several reloads and sometimes not. Take the shell that failed to fire and put a straight edge across it. See if it is concave compared to a factory load.
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