So from what I've learned so far working with the 338-06,with the same case,going from 30cal up to 338cal it looks like you may be able to push the same weight bullet around 150-200fps faster out of the 338cal.So I would think in the case of the 338 Federal,I would think the 160 TTSX Should be able to get around 2900fps or maybe even a bit more.A 180gr Accubond should be able to around 2800fps or maybe a bit over.The difference between the 338 Federal and the 338-06 still looks to remain about the same difference between the 308 Win and the 30-06,giving the velocity edge to the larger 06 case.Powders that work well in the 308 Win look to be the powder choice in the 338 cases.

~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............