My .257 Roberts is my favorite rifle and has taken a lot of antelope with Barnes 100g TTSX and Nosler 110g AB. Daughters and nephews love it as well and have used it to take antelope. The .257 Roberts was gently used when I acquired it in 2004 and has served very well.
These days I would purchase a 6.5CM instead and without a second thought as it has similar recoil to my +P Roberts loads with better downrange ballistics. It is an excellent choice for your son and antelope. As has been pointed out above, it is also good for deer and elk at typical ranges.
Me, too. I'm a life-long .257 fan and have a solid stockpile of bullets 'n' brass. I don't need both, but if I were to find my .257 stolen, I'd replace it with a 6.5CM in a heartbeat.
Tom
