Out of curiosity , I looked up Google reviews for Ginex primers. A competition shooter in England got better SD with them than CCI BR2 s. But this review was a while back. My experience has been primer lot# do matter.
My go to load is with Fed 210 primers, someone gifted me some of these primers to try before I buy small primer brass, I picked up 30 FPS average with my same spicy load and my ES/SD was pretty much cut in half, your mileage may vary as I am shooting a 7mm creedmoor ackley improved short