The case is longer on the .280 by ~.040". The length to neck/shoulder juncture on the .280 should be around .018" longer. The neck should be shorter. Of course this all depends on who's reamer it is and who cuts the chamber/sets headspace.Sorry let me clear things up a bit just wanted to know if the shoulder is different or the neck one longer than the other? there can't be much differance between the two.