Shotguns - Especially single shot will be a valuable SHTF commodity
I’ve acquired many $50 — $100 investments in this - along with cases and cases of buckshot
One scenario is trade
Another scenario would be arming your neighbors who didn’t prep - Arming them in such a way they can protect their stuff but not have enough firepower to take mine - Added bonus of every scavenger they eliminate is one that I don’t have to and an alert that the neighborhood is being probed etc . . .
In either case it’s so simple to operate a child can do it -
It gives the ability for even a novice shooter in my camp to guard a bedroom window or two or bunker up in a safe room
A cheap preparatory investment in any scenario
In the woods to scavenge - feed and defend my “One Gun” would be my — HR topper 12 ga. w/rifled slug barrel — With 9mm - 357mag - 22 Lr - 22 mag. Rifled Inserts - 20ga. & 410 conversion inserts— As well as a couple of all brass 12ga. Shells and primers - All the extras weigh very little and fit in a crown royal bag and take up virtually no space for the versatility benefit they provide
Don’t discount shotguns - They do have their merits
While shotguns aren't useless, they are very specialized to a few things (extreme close quarters combat, taking small fast game like birds and rabbits, breaching doors). They are a poor choice to hand out to inexperienced shooters or children due the high recoil (I'm assuming we're talking about 12ga which is the most common/cost efficient), low capacity, and constant need for reloading. Single shot shotguns are about the worst choice in defensive firearms that I can imagine, reliability is about the only thing going for them (they are cheap but pump shotguns are only a little more and provide far more usefulness).
On arming your unprepared neighbors: If you don't trust them with a rifle, you shouldn't trust them with a shotgun either. They can kill you just as dead with a shotgun, the standoff range of a rifle isn't going to matter as long as you consider them friendly and don't shoot them as they come over to visit.
On novice shooters: They'd be much better off with a high capacity semiauto rifle in 5.56/.223 (or heck even a 22LR). They'll be much better able to defend with an AR15 than a 12 gauge, higher capacity, less reloading, lower recoil. Not long about a young teen in FL killed a couple home invaders with a 10/22, 25 rounds of 22LR inbound is nothing to laugh at. Even a novice shooter with a semiauto rifle could suppress or pin down bad guys while the more experienced shooters/fighters move to flank them. You aren't suppressing anyone with a single shot 12ga. Also to consider are the range limitations of shotguns and the need to adjust aim for the drop, not a great plan for novices.
Why would you take a single shot shotgun and 47 caliber conversions to go out in the woods? Do you not plan on bringing ammo with you? You have very little defensive capability with a single shot, regardless of your ability to shoot a million different calibers. You'd be far better off with a suppressed 22LR pistol for small game and a 223/7.62x39/308 mag fed semiauto (AR15, AK, AR10, FAL, etc) for medium/big game and defensive use. The caliber conversion shotgun stuff is cool but not that useful...it's a much better plan to shoot common (and cost effective) calibers and keep stocked up on them vs. banking on scavenging ammo post SHTF. If there's ammo lying around, there'll most likely be guns lying around too (and dead bodies, because live people tend to take their **** with them).
I'd take a bolt action rifle over a single shot 12ga, if I had to choose between them.