Originally Posted by fireguy
Going along that line of thinking, no police officer in the nation would have a Glock, Beretta, Kimber, etc. service pistol. How about the weapons used by the armed forces? Not only auto-loading, but full auto. Modern designs properly maintained are reliable. A revolver has just as much chance of not going off with a mis-fire or squib round as my semi-auto shotgun has. I click the safety off and it goes BOOM, if another shot is needed and it fails to fire, I cycle it and try again, but this is not very likely.
Autoloading reliability with a .45 ACP is a lot different than reliability with a shotgun and the different loads that may be put into it by a police officer. He may be equipped with 00 buck, slugs, CS pellets, and rubber slugs, each of which may be combat loaded depending on the situation and have different pressures and recoil profiles. Most automatics can be adjusted to run these different loads but to get 100% reliability from shot to shot with no adjustments between different loads pretty much requires a pump or lever action gun. For a slight increase in rate of fire you loose either versatility or reliability and that's why the police still love their 870's and 500's.
For home defense this doesn't really apply; pick a load (at in-house ranges up to forty feet, #4 bird-shot is big enough since they will hit as one mass anyway). If you can run 200 rounds of it through the gun with no malfunctions you can be confident in that gun with that load. Also, think about how that that thirty inch goose barrel is gonna be around the house; if you swap or chop the barrel you'll have to function check it again.