Goforchrome:

The 325 WSM balistics are superior to the 338 Win Mag.

You can do your own search for balitics data, but from the multiple sites I've checked, the 325 catches the 338 at 300 yards (for energy)because of better balistic coefficient and cross sectional density of the bullets. It keeps better down range energy and has better trajectory over any range.

Here's one comparison you can check, but there are tons of others:

http://www.browning.com/products/features/detail.asp?id=77

Bottom line on the 325: It's a bad boy.

Cheers,
Dan
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Thanks,

Fisherdan