From reading your post, I would say you are fine. If I understand correctly... Assuming your speaking of OAL, not actual projectile length.
If the federals are premium line ammo, they like to turn a cannalure and crimp in the bullets. They also tend to run the OAL shorter then other makes.
If your sure your memory is correct, dont fret on it. Have fun with the song dogs and report in, when you get home!!
CW