Here?s a sampling of my test results with .475 caliber bullets.
One may want to consider Hawk?s 475 caliber lineup, Hawk will also work with you on custom orders. That said, the fact that Doc Rodgers has taken Lion and Cape Buffalo with the Barnes 275 XPB was a deciding factor in my 475-bullet choice.
My velocities were recorded by lab radar.
I score the wet newsprint results every 3 inches until the bullet is found. However, getting my excel matrix to display correctly here is a bit of a challenge. For ease of reading, I?ve limited this data to total penetration, bullet diameter and weight retention.

Wet Newsprint Test ? BFR 7 ?? .475 Linebaugh - Medium Distance 50 Yards
Bullet Powder Charge Primer Mz - Velocity
Barnes - 275 XPB A#9 28.5 CCI 350 1667
11.5? Stopped
Bullet Dia 1.048" Wt. Retention 274 / 99%

Bullet Powder Charge Primer Mz - Velocity
Barnes - 275 XPB A#9 29.5 CCI 350 1755
15? Stopped
Bullet Dia 1.011" Wt. Retention 274 .3/ 99.7%

Bullet Powder Charge Primer Mz - Velocity
Hawk 300 x .025 HP A#9 29 CCI 350 1567
12? Stopped
Bullet Dia .781" Wt. Retention 267.4 / 89.1%

Bullet Powder Charge Primer Mz - Velocity
Hornady 325 XTP A#9 27 CCI 350 1549
17? Stopped
Bullet Dia .749" Wt. Retention 301.2 / 92.6%

Bullet Powder Charge Primer Mz - Velocity
Hawk 350 x .025 HP A#9 26 CCI 350 1459
13? Stopped
Bullet Dia .880" Wt. Retention 306.0 / 87.4%