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The Range
Handgun Discussion
What's Happened to the .40 S&W
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<blockquote data-quote="EKing" data-source="post: 3264834" data-attributes="member: 43282"><p>In this instance, the 40 is the better choice but not simply because it is a bigger bullet. The 180 grain 40 has a higher sectional density (SD) than the 115 9mm and therefore has a higher penetration potential. If you had 155 grain bullets in your 40 and 147 grainers in the 9mm, one might be tempted to think "hey, it's still a bigger, heavier bullet; it must be better" Here's the SD numbers</p><p>9mm 115 grain 0.130</p><p>9mm 147 grain 0.167</p><p>.40 155 grain 0.138</p><p>.40 180 grain 0.161</p><p>Of course SD isn't everything and bullet style, construction and velocity all have a say in this. </p><p></p><p>If I had to choose between only 9mm and 40 for bear defense, I'd carry this 9mm load from Buffalo Bore <a href="https://www.buffalobore.com/index.php?l=product_detail&p=388" target="_blank">https://www.buffalobore.com/index.php?l=product_detail&p=388</a></p></blockquote><p></p>
[QUOTE="EKing, post: 3264834, member: 43282"] In this instance, the 40 is the better choice but not simply because it is a bigger bullet. The 180 grain 40 has a higher sectional density (SD) than the 115 9mm and therefore has a higher penetration potential. If you had 155 grain bullets in your 40 and 147 grainers in the 9mm, one might be tempted to think "hey, it's still a bigger, heavier bullet; it must be better" Here's the SD numbers 9mm 115 grain 0.130 9mm 147 grain 0.167 .40 155 grain 0.138 .40 180 grain 0.161 Of course SD isn't everything and bullet style, construction and velocity all have a say in this. If I had to choose between only 9mm and 40 for bear defense, I'd carry this 9mm load from Buffalo Bore [URL]https://www.buffalobore.com/index.php?l=product_detail&p=388[/URL] [/QUOTE]
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