I can't help any with load data, but I have a question/comment. It looks like you have just rechambered a factory 243 barrel. Who did the work and how many rounds went through it before you had it rechambered? You may have some well worn rifling right in front of your throat and the accuracy you see is all you are going to get with this barrel. just my $.02 worth.

Then you will know the truth and the truth will set you free.
John 8:32

A lie doesn't become truth; wrong doesn't become right; evil doesn't become good, just because it's accepted by the majority...Rick Warren