Restored an Enfield once whose previous military or insurgent user must have just managed to reload before succumbing to massive wounds.
The magazine follower was deeply pitted, not just pits but more like craters, and the underside of the bolt body had a huge chunk missing, eaten away with deep furrows black at the bottom. The bolt handle was eaten away in the same manner and when cleaning the stock the odor of decomposition was strong. Good parkerizing had protected the receiver but at the action strap some corrosion had started with slight loss of material. The stock at the socket was like a rotten tooth.
Hemoglobin in blood will cling to the steel and isn't used up in the rusting process. Blood rust can be very deep and localized.
You can tell blood rust pits by the black shiny gunk at the bottom, and the way grain and imperfections on the metal show.
I replaced the bolt and bolthead, cut away rotten wood and built the grip end of the butt up with JB weld to use temporarily til some better wood came along. Like to never got the stench of death out of the wood.
How bout you? I think some places might do that on purpose so I feel sorry for it and want to take it home into better care 
