RE: should I get the 257 Roberts?
Don't flame me, I'm just repeating what I read.... In Clay Harvey's book "Rifle Cartridges", he complains about the .257's lack of accuracy. I know a dozen people will chime in about their .257 shooting one holes groups all day long, and your's may. I just think it's an interesting read.
I've only had extended experience with one .257. An older Ruger that wouldn't shoot anything under 2" at 100 yards. Despite that my cousin has killed probably 20 to 30 deer with it over the years and still carries it every fall.