I think if you do th same comparison with the30-06 280. 7-08 and other mid sized cartridges that under 300 yards the performance is quite similar using bullets of 130-150 grs or so. A intersting article is one from. A few years ago where JB aka Muledeer compared the trajectory of the 308 and 300 mag.
I'm always amazed by folks that will argue about the difference of 2-3 inches in trajectory at 300-400 yds when the cross hair of their scope covers that much space.
