Actually its not a new chambering, its a re-introduction from back in the 60s I think. It has been mostly overshadowed by the 264 Win. Mag, and 7 MM Mag.
Obtained velocities are about 100 fps faster than a 24" .260 (about the same as a moderate velocity 6.5x284), but barrel wear is probably 30-40% faster than the .260 (although about 10% slower than the 6.5x284).
Obtained velocities are about 100 fps faster than a 24" .260 (about the same as a moderate velocity 6.5x284), but barrel wear is probably 30-40% faster than the .260 (although about 10% slower than the 6.5x284).