Sightron and Weaver 36X are the units I use , best bang for the buck and no problem focusing down and below 50y/m ( sometimes it helps to be a bit short to see the mirrage boil)
Leo are nice scopes , lots more out of pocket, do not think it's worth it though for 50y/m, be real sure it can focus slightly below 50 yards, not all of them will, I have several and at 50 yrds they are a bit fuzzy/ blury, They extended focal range units take care of that problem though.
I have trouble with everyone always wanting variable power rigs, as I just call them variable problem units, like to stay with KISS principals. Lot less to get out of wack in fixed unit.
I suppose if you are multitasking the scope/rifle, ok then.
Any way my highly devalued 2 cents worth. Chris