OK it was just too much for me and I had to run the math on both the 280 and 270 WSM.
270 WSM 150gr SST 61gr 3155fps 3.46 lbs/sec 13.9 fps 24.01 ft/lbs 1734 ft/lbs -33.2"
280 Rem 150gr SRII 55.0 2995fps 3.22 lbs/sec 12.93 fps 20.79 ft/lbs 1530 ft/lbs -37.5"
As expected the 280 performed amongst the best of them, actualy coming in just shy of the 7mm-08 for effecency, though I did opt for the slightly more streamlined 150gr for the larger 280 case. Effecency numbers were 78.75 fpe per lbs and 27.83 ft/lbs per gr. My grandfather was an avid hunter, and of his 300+ firearms his Rem 700 in 280 was his favorite.
The 270 WSM is a BEAST in terms of downrange performance shooting flatter then the 243 and 25-06 even with a 150gr bullet, and downrange energy is even better then the 30-06, what surprised me though was even with it's slightly overbore case the WSM still packs fantastic efficiency numbers coming in at 72.25 fps per lbs 28.42 ft/lbs per gr. No doubt about it if you want grade A downrange performance with sub 30-06 recoil the 270 WSM is FANTASTIC. On a personal note the WSM is one of my favorites to handload, while I don't get quite the speed listed in Nosler #7 I can shoot cloverleafs all day long with a 150gr SGK over RL22, darn thing is a tack driver even with it's Tupperware Savage stock. If the WSM has any downside it is it's overabundance of power, much like the 30-06 or 7mm Rem Mag at full stroke it can and will make a mess of a whitetail inside normal hunting ranges, left a 6" crater through the last deer I shot with it.