Sounds similar to H4350. I think I started at 40.0 grains when I ladder tested my 6.5 Creedmoor using H4350. I have not shot it since. Hornady 140 ELD Match were used. 41.5 gr of H4350 was the exact charge I used that was pretty much the best group I had with my Shilen Creedmoor barrel. (I did have one pesky flier that kept it from being a one hole group.) I did not chrono it. 40.5 gr was perhaps my best group since no flier, but all groups could be covered with a dime at 123 yards.

Would like to hear your results with that powder.