Thanks to all for the replys. Eventhough it went completely off the question.

There are big caliber guns in the safe for bigger game. I just don't have knowledge or experience with smaller calibers and there capabilities. For the requirement I have now I have narrowed it down to these 2 calibers. I just needed more info into their capabilities and mainly recoil.

My son is very small framed. He shot the 30-06 with suppressor and it was to much for him. So I want something with less recoil, but with as much "capabilities"/versatility as possible. Something he will be able to use the "longest" time for "more" shooting.

I don't want to spend R40k on a setup and then he only uses it for blesbuck shooting.

So I think the 6.5 CM it will be (as I can gather the recoil will be close to that of the 243). He can then use it for hunting as well as long range shooting if he wants to do that later in life.