Even if you match the reticle perfectly with your load, it'll only be matched for those environmental conditions. Change temp or elevation and you'll find yourself back at the drawing board, but instead of having regular increments between your hash marks (like a mil-dot or other milling/moaing reticle), you're stuck relying upon some smartphone app to tell you the range each circle now represents...

I hate the gimmick that is BDC reticles - absolutely irresponsible by the sporting optics industry to market something as making a 600yrd shooter out of anybody.