AP,
I'm enough of a "prepper" to understand & realize the need to have certain things stockpiled for certain eventualities, but I'm not enough of a "prepper" to base any of it on teams & patroling, and certainly not with long-outdated guns using questionable surplus ammunition.
I have evaluated certain realities as well as certain possibilities.
I have sufficient long guns to cover short, medium, and longer range uses, and reliable ammunition stocks to be used in them.
None will be used by a "team" (I wouldn't count much on a team that relied on a Mosin, and certainly not one I had to provide for it), none will be used "on patrol" (what exactly do you figure to be patroling?), and none are antiquated designs or decades old ammunition that may or may not ignite, or shoot worth a damn.
If you're basing your projected doomsday scenarios on a Mosin, so you can buy relatively cheap 1970s surplus ammuntion & shoot it from rooftops to save your hide, you need to wake up & face reality.
And I say that as the owner of a 1940 modified Mosin that (with a scope that I would NOT drop off a roof) shoots a little over an inch at 100 yards with good commercial loads & just under two inches at 100 yards with that 1970s ammo.
Un-modified rifles here won't do that well.
On the other hand, my 24/47 Yugomauser has gone under an inch, unmodified, with iron sights, at 100 yards, with new PRVI Partizan stuff, and has outshot my scoped Weatherby Vanguard.
The Mosin's a classic battle rifle, but it's an awkward design with a short bolt that provides inadequate leverage for best efficiency, and an extremely inconvenient safety.
I like all of mine, but they would never be on the doomsday list for survival purposes.
Too many far better choices.
I was hoping you were kidding. Guess not.
Denis