It has been my experience that "lightly or barely" prepped VIRGIN brass will not shoot quite as well as very well prepped VIRGIN brass. If all you do is turn the necks and run the brass into a mandrel and or sizer and load them, they will shoot okay, fairly good in fact. However, I have found that if you turn the necks, ANNEAL the brass (Yes, anneal new brass) then run them back thru a mandrel, apply Imperial Dry Neck Lube, charge and seat the bullet, the VIRGIN brass will shoot right with once fired brass no problem. The annealing process, I believe, is necessary and the application of the dry neck lube REALLY helps in consistent seating. I have shot several "cleans" at various distances with new / virgin brass that has been annealed and the lube utilized.