When the bullet is, close, touching, or into the lands it is met with immediate Resistance when it is fired, which builds pressure, if you seat the bullets shorter you allow the bullet to get a "Running start" which dissipates pressure, what you are essentially doing is increasing the freebore, in technical terms it is called the "free travel clearence jump" or in layman terms jumping the lands, Weatherbys are set up with extra freebore, that is why they can sustain so much pressure 70,000 psi plus and get the speeds that they get.
Spanky
PS: I never have any issue backing up or elaborating on any of my posts, if I did I would find another place to hang out, so fire away.
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