I have been loading 82gr of h1000 or 88gr of 50bmg in my 257stw with 120's for several years now and never have had any issues the othermorning when i was at the range it was in the mid to high 80's around 8 in the morning. Well i noticed this for the first time that the firing pin was either cutting a small hole in the primer cup that looked like a punch was used perfectly uniform in diameter, the other thing i noticed was that a deep pin mark was left with a high burr left. The bolt was not sticky nor was the primer flattened or the pocket deformed in anyway. Could this be that my firing pin is to deep? Or is this a sign of excessive pressure?