Evening all. Had an interesting range session yesterday with 55gr Nosler BT with a starting load of 45gr of H414. Shot a one hole group but the primers were slightly proud of the pocket upon ejection and having double checked powder manufacturers data and Quick Load there is no way this can be over pressure and certainly no other signs on case or issues with bolt.
I have heard of this symptom with low pressure failing to seal the primer and allowing it to be pushed back by the gas through the flash hole. Am I correct? Am I missing something? Are there any issues with this?