"Skinny, fast bullets" are favored by guys like Chris Forrest with Tactic in Montana who have tested a lot of differet calibers/loads to see what is worth carrying for bear defense. 9MM isn't as good as a 10MM, but it has proven itself lethal against grizzlies multiple times when loaded with the BB 147 grain +p Outdoorsman. It is carried by a lot of hunters as they can shoot it accurately and practice ammo is cheap.
The 45ACP shoots a fatter, slower bullet which may not penetrate as well. The 45ACP and 10MM shoot a similar sized projectile but the 10MM is loaded to a much higher pressure so people who want to use a heavier grain load are going to choose that option. Some people struggle with accuracy with the 10MM so the 9MM is a better choice for them especially if they already own one. I'd definitely carry the 9mm over the 45ACP.
The 45ACP shoots a fatter, slower bullet which may not penetrate as well. The 45ACP and 10MM shoot a similar sized projectile but the 10MM is loaded to a much higher pressure so people who want to use a heavier grain load are going to choose that option. Some people struggle with accuracy with the 10MM so the 9MM is a better choice for them especially if they already own one. I'd definitely carry the 9mm over the 45ACP.
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