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.
Yep, and its not just that they use small primers, the flash hole is smaller and can cause ignition problems.
