and for jsut in case... 
BTW, my neighbors are mostly idiots. Some are idiots with guns which puts them at the top of the don't trust list (like the one city freak who chased a squirrel from several houses down, shot it at my child's window and left it there). Others are idiots who can't abide guns which puts them right below the first group. Other potential TEOTWAWKI enemies fall below the first two groups.
and for jsut in case... Here on the East Coast everybody has a 12 gauge shotgun and we use buckshot and slugs because its common for deer hunting. We prefer #4 buckshot (sometimes hard to find) over 00 due to the fact that you get more pellets per round and as we won’t be using the shotgun over 25 yards. Over 25 yards all others get M-4 or AK-74. LOL!
Federal’s good ammo. We also use Remington and Winchester. We currently have our Mossberg 500 tactical loaded with the first two rounds being Federal defense loads and the next four in 00 buck as we have not been able to find any #4 lately.
When we bought the Federal defense loads a couple of mos ago the guy behind the counter at Pro Bass very quietly said “I wouldn’t put those on my Bass Pro Shop reward card and I would pay cash”. He looked like former military and my fiancee’ kind of looks like a shooter which he is. Plus he had his US border patrol hat on so we got the picture. I’m just passing this on to all you freepers. We take that to mean the Feds are monitoring all ammo purchases and probably making Pro Bass cooperate. Livin in the USSA. Ain’t it grand?
Drywall stops buckshot too - if you're defending your family the worst outcome is accidently killing a sleeping child 3 rooms away...
PING!
Are you going to carry both a rifle and shotgun with you? Go back and get your rifle? My ourdoor load would be first round a #4 birdshot 2oz turkey round. Also we have rattlesnakes around here, and that would work fine for that, as well as effective for self defense within 25 yds. Then alternate between slugs and #4 buckshot. If overpenatatration is an issue (neighbors close by), stick with birdshot or #4 buck. BTW, have you tested your rounds at 100 yds? I don't think any shotgun pattern is going to be effective beyond about 50 yards, even with a full choke, and buck is usually fired from an unchoked barrel.
My opinion is that if a man can own only 1 gun, it should be a 12 gauge shotgun of some kind. It can do everything from hunting to fighting, within its limitations. And a supply of buckshot will generally deal with most problems.....
I keep my Mossberg 500a tactical locked and loaded with 2 rounds of #8 bird shot first up in the magazine followed by 4 rounds of 00 buck shot for any intruder who isn’t properly persuaded by the first two rounds.
At ranges inside of 35 yards or so there is no more effective personal defense weapon than the 12 gauge shotgun loaded with buckshot. At that range it’s ballistically equivalent to striking an assailant with 9 9mm rounds simultaneously. That’s serious firepower.
Anyone’s SHTF stash should have as much of this type of ammunition for the shotgun of your choice as one can reasonably procure.
Coincidentally I was at Cabelas last weekend and they had cases of what was marked as Military Grade MG Buck, $4.99 for a box of five. Winchester is the manufacturer. I tossed 10 of them in my cart along with another brick of .22 LR ammo. Why not?
Cabelas webpage says the muzzle velocity on these is 1325 fps. Obviously this isn’t the Federal that you wrote about, but at that price in those quantities there’s really no reason not to have 20 or 30 boxes of this stuff on hand.
Of course one should test this in an autoloader to be sure it functions well, but for almost any pump on the market I’d recommend this stuff without reservation.
CQB with big brown and fuzzy.........shotgun 101.