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Message: <blockquote data-quote="Dragoon300" data-source="post: 2449384" data-attributes="member: 115285"><p>If you select the bullet you are using from their bullet file they know the advertised length and fill it in. They also know the other dimensions of the bullet that determine the case volume the bullet takes up, like the boat tail or base configuration and distance from the base to the bearing surface of the listed manufacturer's bullet. These are the dimensions that determine how much volume the bullet occupies from the case mouth, into the case. Seating depth is the most accurate dimension for this, but overall cartridge length will then tell them how much volume is being occupied by the bullet too, however bullets overal length vary quite a bit, seating depth should not, so it is the best dimension to use. It doesn't matter how long the bullet is, only how much of it is seated into the case to get that information.</p></blockquote><p></p>