A good friend of mine has a M70 300 H&H that he is intent on having rebarrelled to 375H&H. He says that would be his "big" gun. When he talks the corners of my mouth reflexively inch up as I try to avoid showing a smile. I see myself about 35 years ago doing the same thing and saying to myself: there, that gives me a rifle suitable for any big game on Earth. HA!!, since that time there have been rifles added: 375 Wby, 375 RUM, 404 Jeffery, 458 Win Mag and the most recent addition 470 NE double rifle. At present I figure the 470 will probably be final, but there isn't a law against the possibility of a 500, 577 or even 600 so who knows?
All I can do is warn my friend that getting a 375 H&H is just the First step down the big bore addiction road and is certainly not the last.