The whole rifling-twist argument against the Roberts (and the .25-06,and .257 Weatherby) is interesting to me, partly because I've used both cartridges out to around 500 yards with 100-120 grain bullets to know they kill fine. In fact, before we knew 100-grain .25-caliber bullets were a lousy choice for 500-yard shooting, even when started at 3250-3550 fps, they somehow still worked every time I tried them in the field. Though perhaps that was partly because I never tried such shots in "real" wind--which in my experience tends to be erratic
Have also used the 6.5 Creedmoor (and other 6.5s) plenty with heavier, higher-BC bullets and it works great too...
