I just finished inserting primers into about 50 Nosler 308 cases which have been fired once. I cleaned and checked them and did not find any signs of any distortion--I also resized them and deburred/chamfered the necks (didn't need any trimming).

There were about three cases were the force needed to insert the primer seemed significantly less than all the others. It could be just a coincidence in how the shell holder lined up--the point is should I be concerned; and if so what should I do about it?

thanks in advance!