Totally depends on bullet design and manufacturer. You can't just make a blanket statement that X caliber needs Y velocity to expand reliably; it will vary from round to round. That said, yes, most (but not all) reputable .45 ACP defensive hollow points have a fairly high minimum velocity for reliable expansion.
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GSS is an ultra-low-penetration frangible round, totally inappropriate for self-defense use. It does not have the penetration needed to reliably incapacitate a person. Even the Air Marshals don't use them anymore; they realized that there's no point having a round that wouldn't penetrate an aircraft fuselage if it also wouldn't stop the skyjacker. A .45-70 loading wouldn't be much different, either.
Last edited by Syme; 04-03-2009 at 06:06 PM.
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