Yes, it's well documented. I've read accounts of it but don't ask me to remember the publication and the History Channel mentioned it on one of their documantaries about WW-2. Keep in mind the Russians didn't have the cream of the crop for weapons and their partisans etc just used whatever they could get their hands on. They tried to go for the headshots as even the .22 was normally effective there.

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Stat - The problem with a shotgun gets back to the volume of ammunition you can carry. Shotgun ammo is terribly heavy and bulky...and depending on where you live, the limited range of a shotgun could be a hell of a handicap. A lot of the country, the SW especially, you could play hell getting close enough to kill a deer or some nice prize like that with a shotgun.

The .22 extends your range somewhat and will work for turkey, ducks, even quail in the hands of a good shot.

I've given the choice of this weapon LOTS of thought and all things considered, it's about the only thing that makes sense. Certainly the most return for a survivalist $$$. If a guy could afford a thousand or so 22 mag shells sitting around, it might be considered. Would be some better on larger game but don't know how much it would ruin on birds. You don't want something that's going to trash half your meat and birds may be much more a staple of the diet than larger game. Killing a deer and eating the meat or preserving it before it ruins can be very problematic. I've made jerky but never with nothing but a campfire.

Anyone who wants to get into the survival game had better have a lot of time to read, learn and practice their skills. I've gone out and put some of my notions to the test and found reality was far different from what I thought. The one thing I can assure you works is the .22LR. As I said in the beginning........the gun is not the issue. As the old saying goes, "The devil is in the details."