I did that a young soldier. After a long and difficult training exercise we were cleaning machine guns and rifles when I used a 7.62 pull through on a 5.56 rifle (I blame tiredness). I realised what I had done when it jammed fast. I took it to the armoury and owned up to what I’d done. They fixed it somehow and it cost me a jar of coffee.
Moral of the story - take it to a gunsmith. Will likely cost more than a jar of coffee, though.
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