Not so long ago I witnessed an accident that I will never forget involving a Remington 700. A buddy of mine picked up some reloaded ammo from a gun show and was using it to zero his rifle at a place about 4 hours from home.
Anyway after a shot, he jumped up quickly from his rifle and held his hand over his right eye. Then when he took his hand away from his face, with his other eye he say the blood on his hand. At that point he began to freak out. He was bleeding from several places all over one side of his face, but there was no severe lacerations that I could see. It was more like some sort of road rash. He could still see from both eyes, but the right eye was very irritated and he could not keep it open due to pain.
I thought at first his rifle must have blown up, but there was no visible sign of damage to it. Then I extracted the spent round and found that it had ruptured. Not sure why, possibly too much powder or maybe the case had too many rounds through it, I dont know. Anyway, the pressure must have blown backward around the bolt and or through the firing pin hole and he too the pressure blast in the face. Obviously the little vent hole did not do the trick.
He was alright after a few days. He had to put ointment into his eye and wear a patch for a while, but he's fine now. He sold off his Remmys since and bought Sakos.
Since then I have always been cautious of Remington 700s until recently when I got checking out tube guns. The butt of a MAK tube gun is attached over the back of the action in such a way, that if the above was to happen, the gas would be shielded from the shooters face and vented out the bolt handle slot. For this reason more than any other, I built a MAK tube gun.