Those 180 Bergers will shoot good out of a 9 twist. That's what mine is and they've proven to be very accurate and hold out a lot better.
If I can recall the BC is somewhere around .698 or better depending on velocity. Ol_sparks .338 Tommy had 186 clicks at 1550 yards with those 250 gr Match Kings. I was around 150 clicks with the 180 gr Bergers! (you guys and your darn MOA
) He needs to switch to those 300 grain MK which are over .7 BC
Anyhow, I'm sure you'll be pleased with them, but you'll find you may need to seat them out a little farther than the Accubounds.