The .380 will drop down into a 9mm Parabellum chamber. I don't have a Model 547, but I don't think the little wire extractor sticks out enough to catch the rim of the .380. Unless it does, the only way to fire the .380 would be to point the revolver straight up, not a good idea from a safety standpoint. And if it does fire, it will swell and might stick as others have pointed out.
I suggest borrowing a .380 pistol if possible. I don't know what kind of test you are running, but firing that round in a gun not chambered for it would void most tests, especially ones involving forensics.
Jim