I use salmon eggs most of the time and do great on them. But a lot of people I talk to swear rainbow eggs work better in the spring, even early, way before the spawn. I used to think they where full of crap. But then I read that there are two different strains of steelhead around here, spring run, witch only run in the spring, and fall run, witch only run fall-winter. Therefor, spring run fish have never naturally come across salmon eggs. I am starting to believe it could make a difference, at least some days.