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1917's were in 45 ACP. If you got it to accept 45LC someone has done a conversion on it. Unless they re-cylindered it, you should have a headspace problem. The difference in rim thickness between 45 ACP/Auto Rim and 45 LC is about .030. It will fire, but really wouldn't be the safe as there would be the chance of blowing a case head. I would take it to a competent
gunsmith and have it checked out.
Dean
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