I'd buy a Schuemann hybrid barrel. I have two that I built in 45 ACP. The hybrid porting is very effective at reducing recoil. Here's the link to the website: http://www.schuemann.com/
thanks for the responses... guess I should have clarified more.. I have the barrel and slide, slide is already cut, I am ready to make holes in the barrel now, I was looking for advise on procedure/safe way to keep down the burring that will occur in on the rifling...