The 450/400 might be one to look at. Also, you might consider the 9.3x62 round, basically a necked up 30-06. For Cape Buffalo, they have a reputation of working just fine and the recoil is less than all of the above. It is also legal in some places, such as Zim, I believe, and probably others. Also, with your known, documented shoulder problems, I'd almost guarantee that you could get a waiver, approval, whatever is needed, to hunt DG with the 9.3 anywhere in Africa no matter what their regulations say. The 9.3 is the route I would go if I were you. The 9.3x62 chambering is becoming more popular over here all the time and factory ammo availability is very good, especially over in Africa. JMHO.

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