Replying to How do i get into 360s

Hi I've been a skier all my life and I would consider myself advanced but most of my experience has been off piste and glade skiing. Ive recently gotten into park skiing and im looking for advice on how to get better. I am confident with 180s, boxes, and some grabs off of medium/large jumps. I cant however seem to complete a 360. I have done many 270s and im starting to get fed up with it. Any help is welcome. Also any advice on hitting rails would be nice.