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Why would the .355 Xtreme penetrator in 90 gr for the 380 auto be a smaller diameter than the Xtreme defender?
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Good question--the 380 auto bullets I have (I don't use the 90 gr x penatrators but do use the smaller ones) appear to have a heel for inside the case of .354 and a bearing surface of .355--whereas the ones designated 9mm are .355 throughout.