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I'm not certain that the seating stem engages the ogive- it would have to have a pretty deep aperture and none of mine do. They seem to engage the bullet no deeper than just behind the tip, to avoid damaging the lead.
Manufacturing quirks and tolerances seem to be the bug. Nosler bullets have less variation than Hornady for me, until the SSTs came along. Barnes, I recall, made a statement one time recommending their bullets not be seated closer than 0.02 (or was it 0.20?) but gave no reason. I suspected it was ogive position variations that occur in the manufacture of pure copper bullets.
If you don't measure your "OAL-OG" not all your loads will be the same distance from the lands and any failure to get really tight groups might be thereby explained. That day.
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