Beaver: It wasn't so much to increase case capacity but to reduce the JUMP to the lands that most of us reamed our 257s to 3.00" OAL so the chamber matched the magazine.

He's correct on the speeds and like I said if you REALLY need 3000+ fps with a 120 you should simply buy a 25-06 or a 25 WSSM. Of course the 25 WSSM is headed the way of the dodo.