Hollcore Jerry Brown is the way to go on the larger reels. I'm not sure if he makes a 50# hollowcore line, but if he does, that's probably your best bet on the 30. I know his 80# is about the diameter of 30# mono and the 130# is equal to about 50#. On my Avet 50's I use a 100 yd 50# test top shot on top of 1100 yds of 80# hollowcore.