For the rest of my life and all over the world would be a .404 Jefferys or a .416 Rem I suppose. Neither of these tears a deer up as the bullets are so tough..and they will surfice for elephant Lion and buffalo...

If in the USA, then a 338 Win. would work well for me, including the Alaskan bears, but a 30-06 with 200 and 220 gr. Noslers would suit me fine also.