Molon,
Since you have more rifles and carbines than I do and a chronograph, could you verify that Speer Gold Dot 64gr out of a 16" barrel has a proper 200yd zero when zeroed at 50yds? I've tried hitting the 200yd plates at my local range but can't do it with either irons or with my Micro H-1.
Specs for Gold Dot 64gr is 3000fps IIRC, but that's obviously out of a 24" loose chamber spec bolt action test barrel.