Just two weeks back from Colombia trip (for work) - luckily had some time to shoot around (albeit much less then I would love to be able to). Had my M6 with 35mm cron asph. The company generously hired a private tour guide for me at my spare time, he took me to a city tour (Bogota) and then to the other one to the rural side. When at the rural, we got to some small town, I asked him for a sstop to shoot around some nicely looking location, it was morning, very few of the people around, excellent time to shoot a nice squares and old caffes with only a few single figures (llike single street cleaner at work) making up an excellent props...so I happily shoot around 30 images and we got back driving to a salt mines nearby we arrived to visit.
Only a hour afterwards, when willing to change the film I realized I'm on something like 40-42 on the counter which made my sweating and hard feeling in my guts...indeed, didn't mahage to ceck film loaded by a rewind crank when loaded that film...it wasn't on take-up spool, so all I shoot there was on nothing....
Luckily we hade some spare time on our way back, so I asked the driver to make a stop there once again on our way back, but that was some 3 hours later - the place was busy with a crowd..
Even though I consider film loading on my M6 to be quite straight forward and reliable if done properly, somehow I noticed all that combersome loading of my M3 makes it somehow more foolproof, probably just due to the fact that more attention and efforts are necessary for M3, so one automatically has to follow all the precautions leaving nearly no chance for M3 to get misloaded.