Guns vs. Injured Space Wolf

Still the Space Wolf kept moving. He raised his bolter and snapped off a shot at one of the heretics, removing his head, then he fired again and again, killing two more Nurgle worshippers. Sensing blood their comrades kept pouring on the firepower. More shots hit the exposed innards where the ceramite carapace had been torn away, ripping through flesh and doing terrible damage to the Space Wolf. I noticed that his bones were not like normal human bones. They were larger and in places had fused together to form what appeared to be another layer of armour around vulnerable internal organs, but not even that was enough to save the luckless Space Marine.
He must have sensed that his death was upon him for he changed direction in an eye-blink and ran into the hail of fire. I do not think anything living could move through the storm of death around him but somehow he closed the distance with the cultists and was among them, bolter still spitting death. He reached out with one armoured hand and crushed the skull of the nearest heretic, broke the neck of another and then stumbled and fell backwards as the heretics hit him with a dozen shots. Even then he managed one last discharge of his own bolter before falling to the ground dead.

Fall of Macharius