Inventory was full, server Hardcore US.
Right click on cartridge in the longhorn in my hand. DayZ crashed.
Tried to log back in an it crashed again, though this may be unrelated as that server had 0 players.
Logged in a second time to a server that some players and I had lost all items that were not clothes or on my back. SKS was unloaded, longhorn had gone, but I could select it from my hotbar and it would go into my hands.