You want a mil-dot scope with a adjustable AO focus on the side. And you want an etched glass reticle. I like the option of a lighted reticle for dark lanes. I use the 4-16X 56 UTG. For the money it's a good scope. I'm not saying it's the BEST scope, but it's worked for me and I continue to use it. The bubble level in the reticle is nice but mounted a bit too low inside the scope. A large side wheel added gives you more room for range marks and more accurate ranging.
One thing that helps no mater what scope you use is how you use it. Consistency in how you move your focus wheel helps a lot. Move it the same way every time you range find. I personally go from near to far until my target is in focus, go slightly past focus, and then back to focus. Here's a video that may help with your range finding.
Good luck!
https://youtu.be/Yy25rlOboiY