Well, kind of. In my 24" barreled 30-06, I'm pushing 168gr Nosler Ballistic Tips at a max charge running mid-2900s. There's no gas left in the tank on that load, either, as another half grain will begin to show pressure signs. So not quite the same velocity. But the real difference comes when you realize the 165/168gr .308cal bullet is on the lower end of mid-weight bullets in the 30-06, but it's on the upper end of bullet weights for the .277cal. Comparing the SDs, you see that the 165gr .277cal bullet with an SD of .307 compares far more favorably to the 200gr .308cal bullet (SD=.301), in terms of weight for caliber. What that means in target shooting is generally - if shape remains consistent or at least similar - the heavier bullet will have a higher BC, and thus a flatter trajectory for a given velocity. Using the JBM Ballistics calculator, comparing the drop of the 165gr bullet in both calibers, at 3000fps, zeroed at 200yds, the difference at 300 is half an inch. At 400, it opens to 1.7". Moving out to 700, the difference is 14.5", which is more than 2MOA more drop. At 1000, it's 58.5" - nearly 6MOA more drop. While drop is easy to account for in shooting, realize that also means wind drift is significantly greater. At 500yds, drift in a 10mph wind, is a little over a minute difference. At 700 and 1000, the spread is 1.8MOA and 3.1MOA. That's where the difference lies, in terms of pushing a 165gr bullet roughly 3000fps.