Keep the film in a ziploc baggie that can be quickly popped out of the camera bag, carry your gear. The *only* time I had a problem was recently with Korean Army security, they didn't listen & xray'd my baggie I'm not sure if they were being jerks or just ignorant. After a recent airport check I asked the hand-checker (Seattle) if there was a better way to pack film (I had 60+ rolls) and he said "no, this is pretty much the best for us."
Some checkers will waste time, sure a lady in the UK last year wanted to inspect and swab each canister and 35mm spool about 50 of them and that was boring but liveable. Yet also at Heathrow, I walked on carrying a steel-spike-tipped hiking pole. I offered it to the ticket clerk, the security guards, and the flight staff, for them to mind it, at each door they seemed satisfied and let me carry it on board anyway.
One hint buy your film as you travel if you can, minimize chances for screwups.