Shotguns
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A shotgun is a long arm roughly the size and weight of a rifle, but unlike the rifle (which shoots one projectile at a time), a shotgun fires variously-sized "shot" in a pattern that spreads the further it flies. Combat shotguns are meant for powerful blasts in closer range combat, or CQB. Another key difference from its cousin, the rifle, is that the shotgun's barrel typically isn't rifled; the inside of the barrel is smooth (also known as a smoothbore.) The shotgun can fire either a load of larger, ball bearing-sized pellets called buckshot, a load of smaller pellets called birdshot, or a solid hunk of lead called a slug. There are many different kinds of shotgun actions, but pump action is by far the most popular in the United States. However, there are also single-barreled break action, double-barreled break action (both over-under and side-by-side varieties), bolt-action, lever-action, and semi-automatic versions that one might encounter as well.
The most common shotgun gauges are 10, 12, 16, 20, 28, and 62 1/2. The smaller the gauge, the larger the diameter of the bore. 12 and 20 gauges are the most common - especially within the United States - and are both exceptionally powerful. It is also a good budget-minded choice. At stores like Walmart, a 100-round case of 12 or 20 gauge ammunition can be purchased for around $20.00, and these cases are quite abundant. The same cannot be said for the other gauges, though lead bird shot is typically the least expensive.
Shotguns rarely have a large magazine capacity so reloading is frequent and usually slow. They are also louder than a .22, more recoil than some medium range rifle rounds such as 5.56x45, making them somewhat intimidating for beginners to fire.
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Break-action shotguns
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Added by DJDavis
Added by DJDavisMost break-action shotguns have their two barrels laid out side-by-side, but some have the two barrels one above the other. This is called an "over and under" shotgun, but occasionally referred to as an "over-under" or "O/U" shotgun. These are very popular with sports shotgunners because they are very well-balanced, though professional shooters usually have the shotgun carefully fitted to them. "Over-under" shotguns can be very expensive - Browning and Beretta O/U can exceed $2000 USD.
A break action shotgun is a good choice as they are powerful, simple to operate and require little maintenance. However, the trade-off is the relatively low shell capacity, at one or two shotgun shells. A break action is not exactly the best choice, but not a bad one either; it beats throwing rocks any day of the week. If you find one, take it until you find a better weapon.

Added by Snikwah23Bolt-Action Shotguns
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These shotguns work the same as bolt action rifles, they are just shotguns. They are usually found in .410 caliber, but they can be had in 20 and 12 guage as well. They are very reliable guns that can be just as accurate as you are! If you have to choose one of these for the zombie apocalypse don't fret it will be a great tool that you will be able to learn quickly and easily.
A viable option for those who live in states (or countries) that don't allow pump-action or semi-automatic shotguns. Many of these shotguns are cheaper than their pump, or even break-action counterparts. If this is going to be your choice for the zombie apocalyse you have made a good one, but unless you have magazines that are higher than 2 or 3 rounds, please for your own sake find a higher capacity firearm.
Lever-Action Shotguns
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Lever-action shotguns operate on the same principle as their lever-action rifle kin -- 
Added by DJDavisLever-Action shotguns are very similar to pump-action shotguns, in that a tube underneath the barrel holds the shells, and the lever operates the bolt, which when operated performs several tasks in conjunction. When opened, the bolt moves back in the receiver, the extractor of the bolt removes the shell inside of the chamber (unload), cocks the trigger and hammer, and strips an unfired shell out of the magazine tube, staging it to be loaded into the chamber. When the lever is lifted, closing it, the bolt slides forward, locking this unfired cartridge into the chamber, making the shotgun ready to fire. If the shooter squeezes the trigger, the hammer falls, firing the shotgun, and unlocks the action so that the cycle can be repeated. A Winchester Model 1887 in 12 guage holds 5 shells in the magazine tube, though this depends largely on what gauge the shotgun is chambered for - .410 shotguns may occasionally hold more.
Pump-Action Shotguns
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Added by DJDavis
Added by Doc6383
Added by Doc6383Some strange custom models, such as the "Remington 1740", have two barrels and one stock. These are heavy, and more unwieldy than their single-barreled counterparts. If you do find one of these, and have nothing else, take it, until you find a single-barrel pump or something more user friendly than a 15+ pound beast of a gun. Older shotguns, such as the Winchester 1897 or even older Ithaca Model 37's, are capable of "Slam-Fire", A technique which allows the user to hold his/her trigger-finger down and pump-to-fire the gun, without ever having to take their finger off of the trigger.
A common shotgun is the Remington 870. It is reliable, available, inexpensive and popular. This allows availability of service and modifications.
The Mossberg 500 is another common shotgun. Its use of an aluminum receiver cuts weight with out sacrificing durability, can be had for about $300-$350 USD. A common modification is the "590" upgrade, which entails swapping the barrel and magazine tube for those of the Mossberg 590. The barrel is uncontoured, allowing for better heat management, adds little weight- enough to help with recoil, but not a bothersome amount, allows for more complete maintenance, and magazine extensions, and even a bayonet.
Semi-Automatic Shotguns
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Semi-automatic shotguns, like semi-automatic rifles, fire a single shell each 
Added by DJDavis
Added by ThatnerdykidbehindthelaptopAutomatic Shotguns
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Added by DJDavis
Added by DJDavis
Added by Snikwah23 Effectiveness against zombies
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Although glamorized as perfect zombie killing firearms, the reality is shotguns are often sub-par to rifles. Their effective range is very short with buckshot and moderate with slugs. The recoil on most shotguns can be substantial, and can be quite painful to unskilled shooters. Also, many shotguns are loud, even with a silencer.
However, a shotgun's main perk is its undeniable stopping power and unrivaled versatility. With the correct ammunition loaded and a trained/experienced shooter the shotgun can potentially became highly effective in dispatching zombies. Due to most buckshot being composed of anywhere from 8 to 20 pellets per shot, it can give the shooter a much higher chance of killing zombie at close range. The fact that it can be loaded to hunt birds to elk, and everything in between, and that it can be loaded with specialty shells, makes it the Swiss Army Knife of firearms.
An honorable mention are cutshells, if you need some extra range with your shotgun you can take a regular birdshot shotshell and do this, as seen in the video above.