Get a copy of this book
https://www.amazon.com/Loads-Practical-Ballistics-American-Hunter/dp/1879356171/ref=sr_1_1?keywords=Bob+Hagel&qid=1578070301&s=boo ks&sr=1-1
There are some loads in there for the Ought Six that are beyond what any load manual ever published. Work up to them.