I'm surprised no one has mentioned the barnes X (or actually the new Barnes TSX - Triple Shock).
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Zach -
Both the X/XLC/TSX and CT Failsafe bullets crossed my mind, but I forgot to mention them. That may be because, in my limited experience, the jury is still out.
The 115g TSX bullets are superbly accurate in my .257 Roberts, but I have not taken any game with them and am not sure I will. A Swift A-Frame may yet get the nod for a .257 hunting bullet, although I haven't worked up any loads for the A-Frame yet.
The 160g XLC provided excellent accuracy in my 7mm Rem Mag - 3 shot groups often result in two holes at 100 yards, and I keep hoping for a one-hole group. But their performance on a buck antelope left me disturbed. I was loading the XLC's to 3020fps and put one through the lungs of the buck at 290 yards. The buck just stood there, coughing up blood. A second bullet in the same area put him down, but his head was still up as if he was just resting. I couldn't appraoch directly so I worked my way around a hill and got a shot at about 100-125 yards, putting a thrid XLC through the heart and finishing a bad job. Examination of the wond channels showed little evidence of expansion for the first two bullets and I feared they had behaved like FMJ's - penetrating fully but doing minimal damage. The wound channel of the third bullet showed some signs of expansion, but it was not definitive.
One of the gun rags I subscribe to (Shooting Times, Sept. or Oct., 2002?) ran a comparison of various bullets impacting balistic gelatin at both 3000fps and 2000fps. One of the bullets used was the 160g 7mm XLC. Both the XLC and Failsafe bullets lost their petals when impacting at 3000fps and mushroomed perfectly at 2000fps. Unfortunately, 2000fps corresponds to 625 yards with my 7mm Rem Mag 160g XLC load and over 475 yards with my .257 Roberts 115g TSX load.
By contrast, the A-Frames behaved well at all speeds, with excellent weight retention and expansion. (IIRC, and I think I do, the A-Frames had the highest weight retention of all bullets.)
That said, I will probably try the .257 Roberts/TSX if I get an antelope tag this year, as I suspect the A-Frame load development will take a back seat to other activities until after Christmas.