I am in the process of building a custom rifle chambered in 7mm LRM. I am leaning towards getting a Swarovski Z5 rifle scope. I was wanting to hear some reviews on this scope for a long range rifle. I had also considered the Z6 to go up to the 30mm tube. I would like to hear any and all opinions, not just limited to Swaro. I am also building this to be a lightweight mountain rifle, so weight is a factor. Thanks guys.