I want to offer up what I think would make a good three gun battery for survival use.
For starters, I have an old pump Winchester .22 rifle. It is probably around 100 years old. A neat feature of this firearm is that you can turn a knurled bolt on the side and break the gun into several parts. This makes storing it easier. It is a reliable old gun that is fun to shoot. There are newer versions (such as Henry) available. Everybody should have a .22 and thousands of rounds of ammo.
Next, I have two twelve gauge pump shotguns. One is a Mossberg and one is an old Smith & Wesson (Yes, at one time they did make shotguns!) The Mossberg is more versatile because it has 2 barrels- one of 18.5 inches and one that is 24 inches long. One for defense and one for hunting. I have never had any kind of failure with either of these.
Down through the years, Remington has made special pump-action rifles for police agencies. These are equipped with bull barrels and come with iron sight (the rear sight is a “Ghost Ring” sight). I believe that you can occasionally find high-capacity magazines for these rifles. Although they are available in several calibers, my choice would be .308 (7.62X51). J&G SALES recently was selling some of these gun but I cannot find any on their great web site now. I think I’ll try Gunbroker.com.
Having all three of these guns with the same type of action should make practice easier as well as training you muscle memory. It could be confusing to some folks to have one gun be a bolt action, one a pump, and one a semi-auto.