I have one on a 338LM, it's adjustable and QD... It's rock solid but expensive as hell...
It's a Defiance Deviant Tactical w/integral 20MOA rail. I figured I could get another 20MOA out of that scope/rail combo (with the right mount) and still zero at 100 but also take it out from that rifle and put it on one of my 6.5Cr or something. I will use it in a PRS match one of these days, just to prove it can be done.
By the way there's a Kahles k624i w/AMR reticle sitting on top of that mount... awesome set up.