Look through as many as you can within your price range and go from there. It's all about how easily you can determine ranges between 50-55 as the main priority. Be very objective when you assess this. Can you do it, how easily and how repeatable is it?
Lots of scopes shift their ranging in temperature, that's something that has to be learnt.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep