Thanks for those words of experience. I've an old AM Reporter on 70.260 (somewhere!) so we could start an AM contest group! A pity we're not closer.
I'm still going to persist on FM during contests, as I'm sure I'm not going to get in anyone's way, even on the calling channel. I reckon most 4M users are on FM anyway, so more could join in, and maybe the band will get a bit more use? Where I live it's mainly 'Tweedle Dee calling Tweedle Dum'.
Anyone else up for trying FM in a contest?