Sights with rangefinding reticles?

[Pickerel]

As I've been looking around for a scope for when I get a rifle, I have been focusing on the reticles. I have never used one in real life, but I really liked the scopes in a few games I have played that had rangefinding reticles. You know, the ones with either two hyperbolic lines going down to the center, the ones with multiple trianges, and the like. This reticle is the closest one I can find, and seems to be based off the hyperbolic rangefinding one. If anyone knows of available scopes or reticles that have rangefinders like this, please let me know. Or if this is just a foolish thing to be trying to acquire, let me know that as well.

[carpsniper]

They look like a great tool if you only shoot one type of ammo through your rifle. The literature I read on the one made by Springfield says you have to order it by specific caliber. This makes sense as the balistics of each calber, and therefore trajectory, is different.
I think it would make more sense to buy a mil-dot recticle and a good range finder. Then see where the loads you shoot hit at different yardages.
Just my 2 cents