Well well well.

It does not surprise me that bozo said to "get rid of that old thing". What a steal! Good for you.

Is black powder allowed in Africa?

I've never owned a BPE rifle but, if I did, I'd try to get it regulated with black first. Correct me if I'm wrong. You can't hurt a 500 BPE with black and a 440 grain bullet.

Cast performance bullets have a .511 435 grain FN gas check that would probable be a great killer.