400, I agree, it's only dangerous if it can get to you, SO if its 70 yds away or more
use your .375 double with a QD scope for accuracy, and if thats your only rifle take the scope off it it goes pear shaped and you have to follow up. The .470 or .500 should never have a scope, its
the rifle you use when its all gone wrong and you are shooting close up, just my opinion, and I haven't shot a buff or elephant so what do I know ??

BUT thats what I'd do, Mike