Weaver EMDR Reticle ?

[obaro]

Wondering if anyone has experience that they are willing to share in regards to this reticle in the 3-15 tactical from weaver. I have had good experiences with Weaver stuff, but have not been able ot look through this model. I am mainly concerned with how much the reticle 'covers up' at ranges of 250-400 yards. I shoot prairie dogs a fair amount of the time and like a finer type reticle for this. The open space in the center may be a good deal to my way of thinking. Any experience with this reticle you have to share would sure be appreciated.