@Chaparral: Lucky you! I've always thought that the .257 Roberts was one of the best cartridges for north American hunting. I have two "bobs" and a couple of .243 win, but I'm fonder of the 25's. My dad made the subtle distinction this way: The 6mm's are varmint rifles that can be used for deer, and the .25's are deer rifles that can be used for varmints.
I'm glad you plan to handload, because the .257 needs that due to the under loaded factory rounds and the limited bullet selection. My Ruger 1-B with a 26 inch barrel and +P loads approaches .25-'06 velocities. If I remember correctly the Remington 700 classics had 24 inch barrels and that should help you a little with muzzle velocities.
Oh...and for a bit of meaningless trivia, your rifle is not chambered for the .257 Roberts, but instead it's chambered for the .257 Remington Roberts. Ned Roberts' original cartridge differed slightly from the commercialized version