Here is the deal. We all know you love your 243 Win, but you just put your foot in your mouth so to speak. I am not trying to take anything away from the 243 Win, but your comparison to the 257 Roberts using an anemic load to stack the odds against the 257 is quite unfair. The 257 Roberts, when handloaded, can outshine the best 243 Win load you can stack up against it. Try running the numbers yourself instead of relying on one-sided data.