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			Personal Opinion:
 It isn't the round that makes the difference. It is where you place it.
 
 During WWII, there were failure to stop reports for the .30-06, the .303, the 8mm Mauser and the .50 BMG. During Korea, many individual accounts mention having to fire multiple rounds (this with the M1 Garand) into enemies to get them to drop.
 
 Put a round where it has an impact on the central nervous system, and regardless of ballistics, it will have an effect. Put a round where it doesn't have an impact on the central nervous system, and there is a chance that the effect of the round will not be noticable.
 
 Round placement. That's what does the job.
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