Old willys,
I looked at that Barnes manual and the test barrel is 24". It's crazy but a 20" barrel, with the same load equates to 2800.

DrtFarmer,
I'm going to look into H100v. It seems a lot of people like it for the 257. For now, I'll run the 100TTSX and if faced with the 400 yard shot, just shoot for bone. Just watch, It'll be a windy year and I won't shoot over 200.