Anyone re-barrel a 270 Win to a faster twist for the heavy for caliber bullets? I'm looking for real world velocities with let's say 165 gr Nosler LR Accubonds or other heavies. I see the new 6.8 Western is advertising factory ammo at 2970 fps for the 165 LR Accubond and am curious how much speed is gained with the Western over a fast twist 270 Win. Thank you.