I agree. Maybe you should start with reloading something more common with lots of published data. I think we all started there. Sort of keeping it between the diches for now. I started with the 45acp back in the early 80s. Explored it and started making my 45 shot shells from 308 & 30-06 casings. There is nothing like making your own custom ammo! Get a reloading manuel and read it. For me 2 or 3 times to understand whats going on and what went wrong. Make all the common mistakes within safe guild lines and you will make mistakes,We all did. We learn from them.
Stick to published data for now and you will enjoy a very rewarding hobby!
When you feel ready, This is the place to learn about the 450B!! These are the best of People you can find....