#3 ULRR’s work much, much better on light light. I have used them with 6# P-line, but it has a lot better action with lighter line for sure. #3 raps are pretty dang light and using a light line helps a lot, the bigger sizes don’t matter as much. 4# line would be fine I’m sure. I usually use 3# line with em and it works great.
This is true.I found that 3lb fishes much better than 4lb(ice magic).4lb has a .002 diameter difference from 3lb.I am going to try ASSO ice heavy in 3lb,heard that it is a very good line that will stand up to an occasional northern.