Loaded 98 rounds of competition 5.56 w/Nosler 69g HPBT projectiles. I measured COAL and about 80% were 2.259"-2.260" Hopefully I'll get some practice time on Sunday.
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The slight difference may be due to the tip of the bullet and not your technique. Do you have a guage to measure from the bullet ogive to the case head? If so measure a few and see how those measurements compare. I use an older Forster seating die and changed the stem to one that follows the profile of the sleeker bullets.
The main thing is to make sure the bullets are seated deep enough so the tip doesn't hang up in your magazine.