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When Jeff was discussing putting the "minor caliber" handicap on the 223, for IPSC rifle shooting, I pointed out that Jeff had said that a .455 RIC had plenty of stopping power. It was a 255 gr bullet, at 650 fps out of that 3" barrel. That calculates to a 166 momentum factor. Well, a 20" 223 can readilyget a 69 gr hpbt to 3000 fps, and still have a 166 momentum left at nearly 200m. I Pointed this out, and asked why then, the 223 was so "inadequate". After all, it's obvious to anyone that it's far better to have a man not be stopped at 250m than not be stopped at axeswinging ranges. Jeff just glared at me. :)

Jeff's ALSO said that a 25 gr .17 cal bullet, at 2400 fps, or a 40 gr .22 bullet, at 2200 fps, would have enough power to both penetrate any practical body armor, AND still have adequate stopping power, by means of hydrostatic shock. 25 grs at 2400 fps is but a 60 momentum factor. a good 223 boattail still has THAT much momentum at 500 yds, man. it's still got 2200 fps at 300m+, too. So much for the 223's being "inadequate" for typical combat.
 
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