Gary
Your comment on the Savage 99 in 257 reminds me of an old, but classic whitetail hunting book "Shots at Whitetail" . Th auther was a big fan of the 250 Savage I think the author's name was Larry Koller. I have the book somewhere. The 250 Savage was a noted deer round.
My family has been shooting rifles in the .257 Roberts caliber for some years -- beginning years back with a pre-64 Model 70, which i was foolish enough to sell.
We currently have two -- a model 77 Ruger and a 98 Mauser action chambered in 257 Rob. I think you can still find a few used Rugers for sale, and the occasional rem 700 special, but I don't think any major manufacturers are offering the caliber currently.
Too bad, its a great caliber -- substantially more punch than the 6mms IMHO. Its an extremely effective deer load, and also good for varmit hunting with 87 grain bullets. Also quite pleasant for kids and women to shoot. Some folks use them for bigger critters or so I hear.
I think the 257 Rob and the Berger 115s will make a really nice deer and antelope combo -- plan to try it.
Bill