nope you pretty much got it figured out. the only difference is being heavier at distance the 30 will hold on to more of its energy % wise. and maybe less effected by wind. the differences? minuscule.
total drop with a handloaded 30 cal. 168 gr. Nosler Custom Competition HPBT with a BC of .462 and a SD of .253, loaded with 63.2 gr. of RL22 has a drop of 51.3" when zeroed at 250 yards. and a muzzle velocity of about 3000 FPS.550 yds at clay pigeons, that's about 40-50" drop for the 30-06.