Thanks for the advice, I had hoped for a little heavier XTP bullet but the 230gr is the heaviest available in South Africa. I buy directly from the importer.
I have shot the 230gr FMJ from my 1:48 24"barrel and they grouped nicely. Only problem I foresee is that they wont mushroom or open up enough due to the bullet-construction on a live target.
I will play over the weekend and test different powder loads, hopefully I will get a sweetload that will work on warthog.