Just filled a couple 15XN reels and a 15. Surprised the 15XN took 350 yards of JB hollow 40# and the 15 took 400 yards. Same line winder and line. Looking forward to a 3 day this weekend to put them through their paces.
Interesting. It may be that when the hollow flattens out, it "lays" differently on a wider spool vs. a narrower spool.