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Does the difference between a 4 inch .45 barrel and a 5 inch .45 barrel have any actual effect on shopping for ammo?

Thanks a million

JimL
 

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Considering that most ballistics testing with .45ACP is performed through a 5-inch barrel, the stated velocity and energy on factory ammo boxes reference the 5-inch testing. With a 4-inch barrel you'll lose anywhere between 50-150 fps. As far as choosing a defensive load I don't think it's going to make that much of a difference.
 

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I have always used normal pressure SD ammo in my 4" and longer guns but in my smaller guns I like to step up to the +P to get back some of the lost velocity
 
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