The barrel should be considerably tighter than what you can get by hand. Merely screwing the barrel on tight is half the battle. Things have to align. Sounds like it needs to either be turned in a thread, or, shimmed. Headspace is adjusted through the use of special, interchangeable inserts.
Lock, Stock and Barrel gunworks SLC, Ut USMC 69-73
"This is my rifle, there are many like it but this one is mine. My rifle is my best friend, it is my life."
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