They are not worthy of inclusion in a survivalist's battery, IMHO, because the money and time spent on them can't then be spent on the far superior AR-15 autorifle (and its .22lr conversion unit.) The .22 unit is what makes the AR so versatile. It offers quiet practice or foraging, without wasting the bulky, noisy 223 ammo. Against "cover-using" men, buckshot is pretty much worthless beyond 20m, if using a typical (chokeless) "riot gun" barrel. 20m heads are an easy "snapshot" with a .22lr autorifle, so I'm not at all content with the capability of the shotgun. Have you ever tried using a pump action while prone? Have you tried to reload a tubular magazine while prone? How about in the dark, either while wearing gloves, or with cold-numbed fingers? How about while lying in the snow, or mud, or water? Are you aware that using different loads of buckshot will change both the POI of the charge, relative to your aim, as well as the pattern-spread? Aare you aware that buckshot and slugs almost never share a common POI? So which will you zero your sights for? Do you know what your pattern spread is at various ranges? Are you aware how feeble a hit 1-2 buck pellets really is? They hit like 380 pocket pistol bullets, so you need to get at least 4 of them into the chest cavity, or it's not reasonable to expect one shot to stop a man. Very few riot guns will reliably do this beyond 25m. How many of each type of shell will you actually carry? That is, birdshot for foraging, slugs, and buckshot? They run about 10 shots to the lb, and are very bulky. So you probably won't have more than a dozen of each type. That = not much combat ability, if the noise of your foraging "calls in" some desperate looter types! I'm sorry if this steps on a lot of toes, but it's the demonstrable facts of the shotgun. The shotgun slug is not very useful without a set of rifle type sights on your 12 ga. Slugs and buckshot are very expensive, so very few people get adequate practice with them. shotshells are very fragile, and prone to contamination. The tubular magazine ditto, and it is both under capacity and slow and awkward to use.