I haven't got experience working in the dark, my bulk loading has all "to-date" been done in daylight. So this is something I'm thinking of doing "next time"...

One thing about coming to the end of a roll and "knowing" it's not going to come out... Like the first few frames of a roll, you "know" they aren't going to come out either...

If you come to the end of a roll while shooting, it's easy enough to change rolls and take a couple shots of what you were shooting at that moment.

So maybe it's not really a big deal.