As others have said, it is the fact that the bullets are not all the same length. This is especially true of HPBT's. Measure a 100 of them for fun and see the difference. Also as Jimbo points out the seater pushes at a particular radius point on the bullet, not the point so it contributes to the problem slightly.
For general shooting "don't worry about it". For precision shooting, sorting each bullet to the same weight and length "may" make a difference but it sure helps the mental aspect of knowing you have everything the same.
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10mm and 357sig, the best things to come along since the 38 super!
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