.270 win

I just got some 125 gr CEB Maximus's for my .270 Win. The only powder I have right now is StaBALL 6.5. I already reached out to CEB about load data and they don't have load data using StaBALL 6.5. I don't want to buy a new powder just yet. Does anyone have any suggestions for a starting point...

https://blog.targetsportsusa.com/the-ultimate-hunting-checklist-ensuring-success-savings-and-safety-with-target-sports-usa/

I got this rifle for Christmas a few years back. And I started reloading at the same time. Not really sure how well it would have shot when it was brand new. I was a beginning reloader, and I wouldn't say I was a good shot at the time. But this is how it shoots now with good loads. H4831...