None of that would be ''safe'' if his bolt isn't forward completely.
The Blaser R8 bolt action rifle is basically a straight pull type and doesn't have rotating lugs that lock into place. Instead, they have interchangeable bolt heads with circular collars, with several different grasping surfaces all the way around, which are forced down and only engage when the bolt is fully closed.
The reason the bolt is holding now, is because the chamber depth is allowing his cartridge to come forward enough to allow the circle of locking surfaces to open out enough to engage the rear face, which is .060 to wide, when the cartridge is fired.
It's actually driving the bolt face back .060 in every time he fires it, which is why he's getting separation in the center of the cartridge case. If the bolt were properly locked in position, this wouldn't be happening and he would just get a bit of normal stretch.
I'm not sure about this, but I don't believe the rifle would fire if the bolt were in the forced back position.
The thing is again, I don't know if this would also cause a dangerous situation even it if would because at least .060 of the newly formed case wouldn't be supported in front of the belt.