Sounds like a light charge to me. You are at the start charge for that powder/ bullet From what I found its 26-27.8.
I would prob load some up to 26.5 , 26.8 and 27. maybe a hlf dozen of each and head back out for a test run.
Thats one main reason I invested in a chronograph, I always test my loads to see exactly where im at. That way there is no guessing involved.