I tried the fixed power LR thing and didn't like it.
First problem, discovered while actually hunting, was that the 40 mm objective I chose was way too small. When the other side of the mountain was in the shade it was useless.
Had to use the second rifle with a 4.5-14X44mm scope. This scope was way better optics and served me well in all lighting and distance conditions. Reticle is mil dot and FFP which I really like.
But not for ranging!!! Spent plenty of time ranging elk with it. The greater the distance the greater the error. Usually the elk were half as far as I was able to range. This was practice and no shots fired. I then acquired a decent laser range finder and learned the error of my ways.
Also, as mentioned earlier, you'll be in big trouble when a shooter pops up at 75 yards and you can't get on it quickly.
Fixed power is great for shooting paper and rocks but is less than effective for live animals.
just my 2 cents