In SxS doubles:
.22 Savage
.303
.400 x 3-inch
.577 x 2 3/4 NE
12-bore Paradox

In bolt-rifles:
.22 LR
.222 Remington
7x57
.416 Taylor
.500 Jeffery

This assumes I could load and access my own ammo. If separation from one's ammo was a liklihood, then the .375 H&H and the .458 WinMag would probably get the nod.