25 creedmoor can be loaded to slightly higher pressures than the 250ai.
So you can use middle of the road 250ai data as a starting point.
I should rephrase what I wrote...
250ai data doesn't reach as high pressure as creedmoor data.
I'm loading 85 - 110 gr bullets in a 10 twist....wouldn't the load data from the 250 Ackley Improved be just about right on the money?
Yes except careful if you use cr brass with small primer