I use the Lee FCD the same way I use sizing dies, powder charges and seating depth, It's a tuning tool for me that is just as important as anything on my bench, I do not use the Lee instructions as I set them up in a completely different manner and in my personal experience I have never seen it hurt a load, I've seen some the groups didn't improve ( although it did tighten up ES and SD's ) but I've seen a bunch that it helped, as I said this is the second time this has happened tom but this instance in particular the weapon had been loaded for two weeks and had been in and out of the truck to the field 40 or so times and dropped once, Like I said this is what works for me and once again I screwed up, Didn't hurt anything this go around as I was close by the house but I was disappointed in myself for not following my protocol from a lesson I learned 30 years ago