old willys,

My experience with the .338 Federal (and similar cartridges, such as the .358 Winchester) is that high BC doesn't help much. They're still moderate-range rounds.

Higher BC does help a lot as the same cases are necked down to smaller calibers. Not so much when they're necked up!

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck