[LibKill]

The .223 is a maiming round designed to cause catastrophic wounds requiring two men to remove the wounded man therefore taking three enemy soliers off the battlefield. The rounds tumble at range and therfore rip up their human targets on impact. Consequently they are not accurate beyond 400 meters.

This was true of the old .55 grain M16 rounds.

The current rounds are good past 500 meters.

And, it never applied to bolt-action varmint rifles.

There are many factors to consider, rate of barrel twist, weight of bullet, and so on.

I may be wrong but most of these murders seem to me to have been within 300 meters.

That's an easy shot with a .223 (5.56mm NATO)

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If nothing else, FReeRepublic is a great source of balistic expertise :-)