The 7mm mag is flatter shooting and a step up in power over the 270.As for comparing it to the 30-06 you should compare bullets of equal sectional densities like the 7mm 150gr or 160gr to the .308 180 gr in which case the 7mm is a fair bit flatter shooting again with an increase in energy.The 7mm 175gr is closer in sectional density to the 200 gr .308 and again shoots noticeably flatter.