I never said that the .243 isn't a good deer cartridge, but as those two loads show, loaded to reasonable velocites, the .257 Roberts and .243 are pretty close. The deer would not know the difference!!! The two you quoted earlier were just simply not fair in regards to the Roberts. You compared the Ballistic Tip to a Corelokt Round Nose, loaded to the anemic velocites that Remington typically does.

One example of this is with the 8mm Mauser. Remington factory 170 grain Corelokt comes out at about 2270 FPS in my Yugo 24/47. With my handloads, I can push a 170 grain bullet at close to 2500 FPS so far, and I still have room to go. A 150 grain bullet can be pushed to close to 2900 FPS out of the Mauser, but you won't find any factory load loaded that hot!!