Popular Calibers?

The popularity of certain calibers changes from time to time. Maybe that has more to do with the innovation of new calibers or making existing calibers more effective. I heard not that long ago that many law enforcement officers choose 40 caliber pistols. Does anyone have any opinions as to why that is? Wouldn't a 45 be more effective in a deadly force scenario? The only reason I have heard for the choice of a 40 caliber pistol is that it offers more stopping power than a 9mm and a higher ammunition capacity than a 45. Does that sum the choice up or is there more to it?

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Dave Thoreson Apr 10, 2021

Yes the .40 Caliber offers more capacity than a .45 and less risk of over penetration. More stopping power than a 9MM although with advancements in 9MM ammo capabilities and increased capacity 9MM is making a strong comeback. The dept. I worked for went t