Quote Originally Posted by Stan. L-B
But, I do bend the edge of the film back against the natural curl for about a 1/4". No problem provided the reel is dry and not bent or otherwise distorted. Just do it again and again with a spare film until you get the knack. Godd luck. Stan. L-B
Stan has the answer here.

I shoot a lot of 220 as some of my panorama cameras don't take 120 as it's too short in length. It took a while to figure out it was the slight curl at the start of the film that was causing the jams in the reels. It's worse too with old film, it seems to have a tighter curl set into it.

So for me the answer was to clip the corners slightly and bend the front edge back and crease it, not too much though. Makes a big difference!