Just got back yesterday after 3 weeks split between Mozambique - Cape buffalo and a bit of PG - and Zimbabwe for elephant. Was able to use the 404 on 2 buffs, waterbuck, and reedbuck- worked well in each case with the Swift 400 AFs. Saw several hundred elephants, some at very close range, but no bulls we wanted to take. So no reports on the use of the Barnes 400 solids on pachyderms, only on a chance encounter with a kudu at a longer range than I anticipated.
The rifle configuration worked well, although a few changes are upcoming. If there's interest in the pics and some details, I'll post on the Africa forum. A magnificent adventure!