Reasons not to use a shotgun during a zombie invasion

[Christmas]

You're not getting my point. I was talking about what you actually have access to. Full auto permits are expensive, so I'm doubting most of the people on here have assault rifles and submachine guns.

All I've seen for full auto permits is an extra 100-200 dollars. Regardless of a slightly steeper price tag, a permit is still accessible.

And it's always much harder to aim when you're in a tight situation than when you're at a range. I bet most of the people here could hit a target 100% of the time with a full clip in a common rifle like a .22, provided they know how to use ironsights. I know I can, and I barely ever get to the range. But when you're in a panicked situation, you're not going to hit nearly as much. And if you read my original post, you'll see that I talk about the number of clips you have. You may have them loaded BEFORE you get into a fight, but in real life, you're clips don't automatically shove your reservoir ammo into themselves. And how many clips do you have for whatever guns you can access? I don't have more than 2 clips for any of the firearms I could access, and I know most of us certainly don't have supply humvees nearby to save our asses/

8 rounds
20-60 rounds (assuming one extra clip)

Shotguns are still beat in quantity before having to access non-loaded ammunition. What are you trying to get at here? This is also zombie preparation, and if I was to prepare for a zombie outbreak, I would have more than two magazines for my firearms.

Zombies don't move terribly fast, so even in a "panic mode" where you have no fear of being shot at, your target isn't that difficult to hit. More difficult than at a range, but not as much as in a firefight.

As for ammo interchangeability, if you happen to be using a .410 shotgun you could use both the .410 shells and .45acp rounds in a taurus judge if you happened to have one.

How common are those two weapons?