I am new to this so i am learning off of ever post, but would like to know if I should once fire form my new brass because of brass under sized in length and shoulder bump. I have once fired brass that measures 2.273 after firing. Run it through sizing die I have 2.269. New nosler brass out of the box comes in at 2.253 and case length is short too, this is all Nosler Premium brass. Case length in book 2.620 I have been trimming to 2.614 Nosler brass out of the is 2.604. could trim down but fired it comes in at 2.611. So should i waist lead and powder to form casing?