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The 222, for instance, using a 50 gr bullet started at 3000 fps, has only 200 or so ft lbs left at a mere 500 yds. this is done intentionlly, to limit undesirable damage done while hunting varmints in populated areas. 200 ft lbs is still quite lethal on men, however. Lethality with a bullet is defined by our military is having at least 60 ft lbs, as the .25 ACP has at the muzzle. By contrast, Go to Berger bullets and look at what the BC ballistic coefficient is for a 90 gr VLD match bullet for the 223. It ranks right up there with the .50 bmg and starts at the same 2800 fps, but it gets going that fast in a 26 " barrel, not a 38" barrel like the .50 needs! :-) It may seem counterintuitive for a 223 to be an effective sniping rd at 1000 yds, but such is actually the case. The guys deliver 10" groups with it at that range and it still has 1200 fps and 300 ft lbs of energy left out there, if it is the 90 gr bullet, started at 2800 fps in a 26" barrel.
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