ORIGINAL: Ridge Runner
boy murphy muffed that one, how in the heck could a 308 have a higher MV than a 270 with the same weight bullet, the 270 is the same case as the longer 30/06 and rated at higher pressures by SAAMI.
RR
Remington and Winchester both show their 150 gr. .270 loads at 2850 fps, and their 150 gr. .308 loads at 2820 fps. He said he was using IMR's reload data, so I suspect there's may be a pretty wide range of combinations for each rifle... Perhaps the .308 load he was looking at was a "light magnum" load, vs. a standard .270 load.