once you have your decaping,belling,seating and crimping dies you gotta make sure your powder charge is at the charge you want,once you got it set at the charge you want throw 10 charges onto your scale then you will have a better idea of how +/- you are and might need to adjust. at times your powder charge will be +/- about a tenth. and also the powders you are using will have an affect, as well as how sturdy bolted down your bench and or your press is also you wonna have brass in all your stations if you are loading progressively so the multiple charges can give you an average of your powder charges! sorry for the run on, good luck!