when a bullet is seated into the case it takes up powder space thus causing higher pressures than a shorter bullet of same weight. There is no "golden rule" per say on how little a bullet should be seated, there is however a rule on how deep it should be seated. If you have it deep enough in the brass so that bullet is secure and have no concentricity issues then your good to go. I personaly like to have the width of the bullet in the neck but cant always get that.
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