[amamnn]

Actually, if you stop to think about it, different weights of standard bullets in the same caliber have to be of different lengths. In the reply above, most of what's being talked about is bullet seating or runout and the idea of seating in such a manner as to approach or even touch the lands is one of the tried and true method of controlling start pressures. However, using the .223 rem as an example, you would find it difficult to run a 40 gr. bullet out to the lands, but have no trouble with an 80 gr. bullet. The leade, or distance from the bullet to the lands, is measured at the center of the ogive of the bullet. This is not the same as the cartridge overall length, which is measured from the case head to the bullet tip.