Even my 30-06 only requires 27" to get it to 1000 yards with the 165 grain bullet I use at 3100 fps out of my Sako Finnbear. It goes subsonic at about 1250 yards 1250 yards requires 41" of coarse these figures are based on published ballistics not actual range results.
The rifle I will set the scope up on is a 6.5 Creedmore which is much flatter shooting.