I apologize, this die was previously set up to this chambers 2x fired brass before bumping. I have 3 different batches. I fired the first one twice, set die, then continued forward firing the next two batches so they all get fired the same amount and rotate, incase I need back to back range days without spending the remainder of the first day in the reloading room cleaning, sizing, annealing and prepping.In that case it's not the expanderOnce fired stiff loads or light loads? did you measure base to shoulder on your once fired to check for inconsistencies? The brass is likely not fully formed and if you set your die off a long piece shorter base to shoulder pieces might be showing up.