Funny this should come up, as I have a set of negatives from the Argust 17th Argus Day festivities right here at my elbow. I think what you are seeing is a larger than typical film gate/frame mask, whatever you want to call it. The sprocket roller inside stops hard against a dog projecting down into the case, so it's either correct, 8 sprocket holes worth, or you would skip an entire frame (or integral number of frames). It's not like some of the paper backed roll film cameras where there is a friction roller metering the film travel. I did once have mine skip an extra sprocket hole occasionally because the roller with the teeth was binding badly, but a CLA cured that.
On the negatives sitting in front of me, the image appears to be a good 37 mm long (the standard frame is 36, so there is a millimeter of space stolen right there). It was pretty typical of cameras to only show about 95% or so of the theoretical image in the viewfinder -- to allow for slide mounts -- or amuse the designers. So in theory you should be getting everything you see in the viewfinder. (If you can see it -- that viewfinder seems a lot smaller today than back in 1957 when I was 16!!!)
Well, as I indicated, a frame is eight sprocket holes worth; so about the only way I could envision that having a problem is if a particular film had an anomaly with the sprocket hole punchings. Film thickness should not have any effect on the amount of film metered out (only how many twists of the knob it takes). Also at my elbow is an archive file sheet of the eclipse photos taken last week with my venerable Canon A-1. The exposed frame length is 36mm, and that extra millimeter left between frames looks huge compared with the C-3. (Although in fact, it's not all that much when trying to slice and dice!)
Takeaway, I believe what you have is normal.
The C-3 was in production for about 30 years and there were a zillion variations over that history, so there might even be variations along the way. The bodies were some sort of molded Bakelite piece and I don't think there was any machining done that would size the film gate, so it's pretty much what came out of the mold.
I did a quick measurement comparison between the C3 and my Minolta XG-M. The Minolta has a frame opening 1.413" (35.890mm) wide. The C3 has a frame opening 1.450" (36.83mm) wide a difference of .037" or .94mm. I feel like that couldn't definately cause an issue.
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