OK. Assuming this is pre-nitro express:

H&H SxS 8 bore rifle with 1000 rounds of ammo for elephant and buffalo.

Purdey .500 BPE with 1500 rounds of ammo. For lion and PG.

Enfield .303 with 1500 rounds of solids and 1500 rounds of softs. For elephant on down. And an extra .303 in case the first one breaks.

Greener SxS 12 gauge with 5000 rounds of ammo.

.22 rifle with 5000 rounds of ammo.

Colt revolver in 44-40 with 2000 rounds of ammo.

And some good steers and wagons to haul it arond.