If you need a backup system, get another rangefinder. With point blank ranges on high powered rifles 500 yards (beyond which Mil dot is useless unless you are very good) - I prefer the NP-R2 reticle on my Nightforce
I heard the same argument 35 years ago with the advent to calculators - when your batteries die my Slide rule will still be working [img]/ubbthreads/images/graemlins/smile.gif[/img] I've still got a slide rule but I have to use my calculator to check the results [img]/ubbthreads/images/graemlins/grin.gif[/img]
I admire anyone who can use a slide rule or mil-dot. I don't have the patience or skill to use either. I'm a victim of technology.
There are plenty of marines who can out shoot me at 500 meters (kneeling ) when I'm using my $1,200 Nightforce and they are using iron sights -