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I think I've described this before, but here's how I handle seating depth:
First, I find the best primer/powder/charge load.
Next, I fiddle with the seating depth until I get the accuracy (and feeding reliability) I want.
Now, here's the "Rocky Method"...
First, using a loaded round that's at the most accurate length, I scribe a line around the bullet at approximately the bore diameter. For a cartridge using .308" bulets, that's about .300". To make the scribe line, I'll set my steel calipers to .300" and lock the jaws. Carefully twist the bullet between the jaws, making sure the jaws are perpendicular to the cartridge axis. That will leave a visible scribe line like this...
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