I have weighed a LOT of 223 brass and NEVER found even half that much variation. I would call the brass you weighed as very unusual
I weigh all my 223 brass. I can give you hundreds of cases that are over 107 gns.
Normal 223 Rem brass that is deprimed comes in around 71 to 75 gns.
I keep all brass in that range and sell the rest.
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