Fritz, 3340fps for a 180 from a .338 win mag is very optimistic. I just looked up both the 338 and 340 wby and max for the wby is 3240 fps. the 338 win is about 150 fps slower than the wby.
Check your data because that is way above book.
The 300 IMHO is a lot better choice for a 180-200 gr. Bullet
the 338 is a better choice for 200-250 gr. loads
the more reliable factor in play here is Sectional Density which is not as easily manipulated as B.C. and will give you more of a snapshot of what is going to happen when your bullet gets where it is going.