The IMS mounts are geared toward AR type rifles. It would work but you will end up with the scope uncomfortably high using the IMS on a 700, especially with a 20-MOA base.
Why ya thinking of going with a IMS? if you're needing to swap the scope to different rifles, LaRue makes a great QD mount for that.
You got a nice base already, get some nice rings Badger or Leupold Mark4's ... They both use a 1/2" wrench/socket to take on-off pretty quick.