jorge, Ive only ever used the 06 culling in Africa on a couple trips, and on some elk and some deer here in the states, so what do I know?
Have you decided it will never work
I borrowed the PH's guns on my trip to SA in May 2013. He had no fewer than 4 30-06's in the closet, along with the usual .375's etc. Didn't have much trouble killing zebras, wildebeests, hartebeests, impalas, oryx, kudu, etc with 180g dog turd partitions.
It is irrelevant what you think. What matters is the TRUTH.