I am also anxiously awaiting the 329. I just bought another 500 Berger 300s for my Norma Imp because I got tired of waiting.
I ordered some 1-9 twist barrels in anticipation of this bullet for an upcoming Lapua Improved build. That should be plenty fast considering Berger recommends a 1-10 for the 300 OTM, and Warner recommends a 1-9 for their 2.05" 285 Flatline.