The reason is that (on an M14), the firing pin hits the primer when the round is champered...deep seating the primer lessens the chance of the primer being hit hard enough to slam fire. Supposedly, if you load a round, then eject it, you'll see a dent where the firing pin lightly hit the primer.
[This message has been edited by Frontsight! (edited September 12, 2000).]
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