I don't recall ever seeing PowerPoint bullets sold as components. Not saying they aren't but I have just never seen them.

I think you will find the Hornady Interlocks to be a close replacement. The construction is very similar and they have been around for a long time. In my opinion, they should be fine for 338-06 or even 338WM. Not sure I would want to use them in a 338LM or RUM though.