Quoted:
Is 5.56mm considered high powered?
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Who knows. [i]That's not a question.[/i]
To the media a damn rock is "high-powered," normal most people (& ranges) consider any centerfire high-powered. Whatever it means, caliber doesn't seem to have much to do with it (anyone doubt the Remington 17 is "high-powered"?).
To the NRA hipower means a "service rifle," or "match rifle." The service rifle category is generally limited to either the unmodified M1, M14, M16, or their commercial equivalents. Match rifles typically are of custom make, conforming to the desires of the shooter. They are more free of regulations than are the service rifles. All shooting, with the exception of limited long range events, are done only with metallic aperture, or peep, sights.
[url]http://www.geocities.com/Colosseum/2325/hipower.html#Intro[/url]