A while back a friend asked me to work up a load for the 100 gr partitions in his sporter 6mm Rem. I used RL-17 and got unbelieveable velocities AND accuracy. I would give RL-17 a try. (see pic)
As for shooting the Bergers I just worked up a load with the new 105 hybrid in a 6mm-284. It was too easy. Bullet seating depth was not an issue. Seated so it could be fed from a wyatt's mag box in a SA Rem 700. Jump is .065". It wasn't luck either. This makes the third hybrid I have tried in various calibers and all were seating depth insensitive. Worth a try. Besides that 105 hybrid has a much higher BC of .547!