Trying to mount a Vortex Diamondback 3-9x40 with EGW picatinny tail and medium signature zee rings. The rifle is a 111fhs long action.

I thought medium would work until I got my rings today. The scope needs to come back I would say a 1/2".

Here is the pic:
http://i51.tinypic.com/25zl4xt.jpg

Should I just get high rings?

Thanks