Sorry, can't help. Have never used small-primer cases when loading either the 6mm or 6.5 Creedmoor. As noted in Ask the Gunwriters, I live in Montana where it can get very cold, and have even had problems with some powders in some cartridges with large rifle magnum primers.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck