There must be some trade offs in variable power scopes:
Cost
weight
accuracy
reliability
effort to get the design right
For a long time I saw scopes with 3 to 1 power ranges, and then they suddenly got bigger a couple years ago. Some of those early high ratio low cost low weight scopes were showing up in qualities as refurbished. I don't know if it was the extra power range or not that was the problem.
scroll to the bottom of the page and look at the pics off all what has to scroll in the scope
http://bulletin.accurateshooter.com/tag/scope/
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"Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist.
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