I can't help with the 168's yet other than what Berger sent me. I just finished setting up the 180's in my gun.
75gr H1000 is where I ended up, around 3,050fps.
From Berger (sorry about the formatting):
7mm Dakota
(COAL - 3.330"; Barrel Length - 26")
Bullet Powder Start Load Approximate Start Velocity Max Load Approximate Max Velocity Fill Ratio
168 Grain H4831 SC 64.5 2747 70.0 2977 91.5%
168 Grain IMR 7828 SSC 63.0 2762 68.6 3001 90.2%
168 Grain RE 25 65.5 2784 71.1 3000 96.5%
168 Grain AA MAGPRO 66.0 2748 72.0 3003 91.7%
168 Grain RETUMBO 68.0 2784 74.0 3014 99.4%
168 Grain Ramshot Magnum 68.5 2757 74.7 3013 93.8%
168 Grain VIHT N560 63.5 2781 68.9 3009 89.2%
168 Grain WW WXR 63.5 2770 68.7 2981 90.3%