Boy;
How long have most of us old guys been shooting, I hate to think about it. Years and years and thousands and thousands of rounds. We've loaded this poor guys head with a ton right at the git-go, his head is probably swimming.
'Hobbs', listen, you have made a great purchase on the rifle.
You are 'just starting out' shooting it.
Cast what you have. I started @ 40-1 also. Learn how to cast with what ya brought. There are many variables to learn and MASTER, temp, time, handle pressure, alloy etc. Learn how to make good bullets with what you've got. When you learn this you can take the info to the next mold, and on the way you will learn many things about loading, shooting, etc, etc, etc.
Those of us that have many years invested in the sport are most often way to willing to provide info, often good, sometimes bad, but I think we probably try to get people running before they can even walk and we all know you can't do that.
Take your time. Seek info and learn how to use it, but remember it will take time,,, and to get really good, lot's of it.
Enjoy and welcome aboard.
Cary