Check this website out. I have been using these bulets for the past year and they are truly amazing.
I get 3100 fps with a 120gn bullet out of my 308. Zero 50m zero 200m.
on 42 gns of RL 10x.
The 7 mm is @ 3200 and the 375 H+H @ 3300 giving amazing groups and flat shooting.
The concept is quite radical but works really well.