At 400 yards, the Barnes 120 grain loads are equal (2 ft/bs difference). At 400 yards, the Nosler 140 grain loads show the 7mm-08 ahead by almost 300 ft/lbs, and it's stll 110 ft/lbs ahead at 800. I wouldn't take either of these for 400+ yard shots on deer.

Kimber has several excellent rifles chambered in .257 Roberts, and Tikka offers the .25-06.

Hornady and Nosler both offer a variety of hunting loads for both the .25-06 and the .257 Roberts. You won't find them at walmart or Ace Hardware, but Midway, Cabelas, Bass Pro, and many others carry them online, and Academy had both the last time I was in there.

Midway shows 12 varieties for .257 Roberts, and 29 for .25-06. They have about that same number of hunting loads for the 6.5 CM, and more for the 7mm-08.

You really only need one for the Roberts, though. The 110 grain Nosler Accubond.