What you are seeing is sticky extraction.

That indicates too much pressure usually. As these are commercial loads, that seems very unlikely.

Too much head space just means it will fire form (if it fires, as its a control round feed the extractor will hold the case in place so likely it will shoot)

It sounds like the chamber is gummed up or has issues (though issues should show in the brass was wrinkles)

The 1917 was never a SAMI approved chamber dimensionaly, nor was SAMI around then. They tend to almost off the reject gauge head space. These are battle rifles intended to function under the worst conditions in combat.

At worst it fire forms but it does not affect extraction. Often cleaning the gun does not clean the chamber. A MOP and I would suggest a good cleaner like Carbon Killer 2000.
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