Your best bet for a good scope in the $400 range is gonna be a Nikon Buckmaster in 6-18 or 6-24x?
To get one in the power range and variable magnification you want, will cost $3,000 and up. You start going above 20 power, you NEED great glass to keep things from blurring due to how all the glass inside scope is designed and stacked to work. Most scopes have upwards of 7 different sets of glass to make work. The more glass you have to get the magnification, the more problems you run into on higher powers and the larger the scope needs to be to house what's inside that scope to make it work.
I know you could get a fixed power scope for less than $500 in the Weaver T-36. Good reviews, but very limited in its usage due to the power. Weaver does make a T-24 which could be better for all-around 200yd shots, but again still limited in its usage.
I would look at Camera Land who is a sponsor here, or SWFA to possibly find what you want as they have scopes w/prices you might be able to live with.
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