I've had the same problem with a lee seater die and military pull down bullets for 30-06. I seat them long, pull them out and measure them and then calculate how much deeper they need to go and seat a 2nd time. With the Lee die, if they need to go .015 deeper, just turn the knob like a clock face 1/4 turn. .010 deeper, the same as 10 minutes on a clock face...it works for me. My loads usually come out within .001-.002 of what I want with this method.
Better bullets will almost always be closer than pull downs when it comes to seating depth. Seems to be the nature of the pull down beast.
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