I've only used Paterson plastic reels but I have used Efke film.Apart from any characteristics of the film itself, I found two things that generally make life difficult.
One was, and everyone else has noted, a changing bag is a BAD environment to load film, even for tank loading. For unloading a camera, fine.
Second, when I was once having trouble I noticed that I tensed up and tended to push the two sides of the reel together. Result - constant jamming.
I now make a mental note to myself to exert a very slight outwards pull on the sides of the reels while I rotate them and I hardly ever have a problem now.
No more changing bag then
Any opinions on the use of desiccant with a full 100ft bulk film roll? No danger of drying it out `too much'?