Condoor,
For what it's worth, I'm in your shoes. I looked at charts and read web forums for weeks, agonizing over several decisions. I finally decided to pick a very popular powder that has a lot of posted data. It's worked well for me so far, but it's also giving me time to do more research and find that elusive "better load."
Also for what it's worth, I ordered a batch of Precision bullets. My understanding is that they are similar to MaterBlasters. I asked the folks at Precision what powder they use. The answer they gave me confirmed much of my prior research.
As a new reloader, I really don't feel comfortable dishing out load data. However, I'd say you could or even should call or email the people (person?) at MasterBlaster and see if they have load data to share, or at least a preferred powder to start.
Good luck!