... I notice that there are some differences, for instance the minimum parallax on the Discovery was 10 yds, while the Marcool is listed as 20 yds...
Where did you get the 20yds for that Marcool? Their web site shows 10 yds.
"Parallax Adjustment Range:<10-500-∞yds"
http://www.marcooloptics.com/index.php?s=ProductShow/48.html
Edit: I was just pointing some facts out. I am not recommending either of these scopes. Though the specs look OK, I don't like the reticles from either of these particular Discovery or the Marcool FFP scopes.
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