American property owners defending Korea Town during LA riots, twenty years ago this week. Note over-under shotgun. When the party opens, you go with what you've got. Here, the deer rifle's longer range and accuracy complements the shotgun's close range limitations. Which demonstrates another truth -- combat, even against rabble looters, is a team endeavor.
The modern armed citizenry of the United States is, by neglectful nature, not "regulated" in the term of the Founders, that is, they are not armed with weapons of common caliber, familiar in their use, and well-trained. Indeed, the most common weapon to be found in American gun owners' closets and gun safes is the ubiquitous 12 Gauge shotgun, some few of the type known as "combat shotguns" but most not. Yet it is also true that when a breakdown of public order occurs, it will be the shotgun that appears in large quantities. It behooves the armed citizen to think through and plan for that eventuality so that the rabbit, bird and deer shotguns are able, within a mix of other more capable firearms, of being effective against the most dangerous game -- two legged predators.
In the 90s, we would work with newbies to "combatize" their game guns, often just by the simple expedient of swapping barrels to something more effective in close quarters battle. Often this was as simple as finding a beat-up long game barrel for a Mossberg 500, for example, cutting it down to 18.5" and adding a shell carrier or two to facilitate rapid reloading.
But the fact of the matter is that when the party opens, you go with what you've got. Period. A little thought and pre-planning goes a long way.