The half bolt is definitely not anywhere near 100% safe. I remember reading about a half bolt chap who fell down a bank and ended up with the muzzle of his .308 under his chin, the bolt closed and a finger inside the trigger guard. Now you'd be kind of thinking along the lines of, "WTF do I do now?" if you had the misfortune to experience that.
I usually have the bolt half open and the safety on.
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