140 eld in the Hornady book shows 41.3 as max.He said Sierra Load Data.
https://sierrabullets.files.wordpress.com/2017/01/6-5-creedmoor-data-final-as.pdf
It shows a max of 42.3 RE-17 and he started at 40.0, which is reasonable. He was getting leakage around the primer at 41.8, well below book max. I suspect some variation in his charge weights OR defective components.