DF,
In my 338-06 with 180 Accubondss,I was able to get 3020fps with 58.0grs of Varget.60.0gr of Big Game gave me 2940fps,so yes 2900fps is achievable.
Good info. 3K is moving that sized bullet.
H-380 is another good one in the 338-06.
I like Varget with the 160 TTSX.
DF