Re: Plane Mil-Dot??
I'm guessing your budget is about 300.
The weaver 3-10x is an excellent scope for the money.
It is equipped with a "standard" or plain mil-dot, but it has good glass and is very well made.
10X is plenty for shooting 500 yards. You won't be shooting benchrest type groups, but it is certainly enough to get you started.
If your budget is limited, do not be swayed by higher magnification. If your budget is about 300, then spend it on something with decent glass and good, consistent internals.
The weaver will give you that. Since it does not have a parallax adjustment, for short range work, reduce the power
If you really want an enhanced mil-dot, then the only thing in your price range is the SWFA SS series.
They are good scopes and hold their value well.
I would recommend the 12X
http://swfa.com/SWFA-SS-12x42-Tactical-Riflescope-P53714.aspx