I believe you should re-think your loading process ... since you have charged cases AND empty cases on your bench at the same time while you are seating bullets there is opportunity for error. Consider getting a powder measure, there is no real need to weigh each charge once you get the measure set. This allows you to quickly charge the entire batch and then have a step in your process where you grab a flashlight and use it to quickly scan the charged cases in your loading block to be sure each case has an equal charge before starting the bullet seating step.