I would feel more confident with that bullet and velocity over the 139 at the same speed.

It will also hold up better if a bit of range is involved. My concern would be if it was against a wet hide as it can initiate expansion and limit penetration in some cases.

You say you have good heavy bullet loads in a previous post on the build links

---------------------------------------------------------------------------------------------------
She shoots great Typical Lothar Walther barrel. Numerous different weights all shoot sub 1" at 100 yards. 140's, 160's and 175's, so far.

I'll pay excess baggage and the 7x57 and 9.3x62 wil go. I can't afford DG so it's Plains Game for me.

I doubt I'll try to shoot anything larger than Kudu with it though. My 7x57 was designed as my Kudu rifle as I am obsessed with them. I don't find them at all tough to kill.
----------------------------------------------------------------------------------------------------

The kudu ara a big animal but usually hunted in the dry but the big reds you are after are sometimes wet with either rain and or mud from wallow's so I would look to the heavier bullets for that very reason. Long way to come to loose an animal because of a lack of penetration. JMHO

That is a beauty of a rifle. It looks as if you have followed the 1904 Africa model.
http://www.mauserwaffen.de/Africa-Model.172.0.html?&L=1

Von Gruff.