Well, my 50 cent.
I just returned from SA. Did 1w of plains game hunting.
Had some problem and lack of time to have my Blaser S2 in 8x75RS fixed before my trip to Northern Limpopo

My Sako AIII 375H&H Mag was in the custom shop.
So suddenly my Sako AV Fiberclass, cal 6.5x55, was my to go gun.
I had it for ~25 years and always used 156gr Oryx.
It makes ~2650 fps in the chrono depending on the temp. Usually makes a 5-10mm 3-5 shots at ~84m, (i use Norma MRP). Yes, I am a fan of heavy for caliber.
The hunt:
I got 2 impalas, 1 Blesbuck, 1 Warthog and 1 Blue Wildebeest.
The Blue WB was a frontalshot at ~170m. Good hit, lots of blod.
He ran about 70m in 1 sec... before he dropped. Sadly we didnt find the bullet in him.
The 2 impalas both were ~70-80m sideshots, the bullets went through. Warthog quartering to me at ~60-70m, perfect sideshot. Dropped when hit. Penetrated both shoulder, found bullet under the skin. 84% weight and 2.5 x expansion.
Blesbuck perfect sideshot, 200m, penetrated both shoulders, no bullet found.
So it all went ok. But for WB etc i will use a bigger caliber next time.
(I hope this was readable since my native language is Swedish, and I am barbequing right now

and spell check are F with me.)
Skål!