Fujifilm Superia 400 Auto-Advance Problems

Tried searching google and apug, looking for some thoughts on this.

I recently purchased a 5 pack of Fuji Superia 400 in 24 exposure and 3 rolls have all "jammed" around 20. Jammed meaning end of roll. One ripped pretty bad when my camera tried to advance to 21.

Im shooting a bunch of Ilford XP2 in 24exp in between the Fuji and those have all made it to 24-26 easy with no jamming.

The camera is a Contax 167MT, Ive never had this happen using other films with this camera, both 24 and 36exp.

Any thoughts? Is Fuji just putting enough film in it and the cameras auto takeup on first load using too much?

Are you saying that the 24 frame roll reached its end at 20 frames i.e. it was not jamming anymore than XP2 jammed at 24? If this is what you are saying then it suggests that a Fuji 24 isn't 24 but 20 instead so when you had the Fuji developed there were only 20 frames and no spare film at the end?

Perhaps you can clarify this? Thanks

pentaxuser

When the Fuji rolls have reached their end, around 20 on the counter, the shutter locks up and I have to switch the camera off/on and then rewind.
The XP2 does not produce this same result, it has his 24 and I rewind, I haven't tried to shoot past 24, so it does not cause any lockup.
The Fuji is labeled as 24exp.

I self develop. I have not had a chance to process these rolls as I am on a trip and will develop them when I get home.

Just curious if anyone had experienced a mislabeled film roll OR auto-advancing cameras breaking films.

I also shoot on a Contax G1 and that thing has never ripped any film and always squeezes 2-3 more frames out of each role.

Thanks fro the reply. I await with interest what your findings are when you get home. At the moment I think there are too many imponderables to make any meaningful observations

pentaxuser