Since this is a pistol-only SHTF question...
I have a XD-40 and a 1911, but I would have to go with the 1911, seven magazines, and a box of 50 extra rounds. Any more than that is an unnecessary burden.
I can fill a 1911 magazine without a loading device, where the XD magazines require the loading device after about the 8th round. It's easier to carry/reload seven 7-round 1911 mags than four 12-round .40 mags, especially when you consider the reloading part of it.
On the other hand, I would always grab on of my ARs as well, and I have an ammo can full of loaded magazines for them, so I'd grab that too.
If I don't have transportation, I'll grab a standard combat patrol loadout (seven 30-round mags), and leave the rest behind.
I have a XD-40 and a 1911, but I would have to go with the 1911, seven magazines, and a box of 50 extra rounds. Any more than that is an unnecessary burden.
I can fill a 1911 magazine without a loading device, where the XD magazines require the loading device after about the 8th round. It's easier to carry/reload seven 7-round 1911 mags than four 12-round .40 mags, especially when you consider the reloading part of it.
On the other hand, I would always grab on of my ARs as well, and I have an ammo can full of loaded magazines for them, so I'd grab that too.
If I don't have transportation, I'll grab a standard combat patrol loadout (seven 30-round mags), and leave the rest behind.