30lb gives some margin for reduction in strength due to knots or general age/condition of the backing. Also a bit nicer on the hands if you need to grab it for some reason.…
Bluewater species aside, won't 20lb suffice for any anadromous fish fighting? As long as it's more than your leader and tippett, wouldn't that suffice?
In my case, it is the baggage of history, starting with trout in small streams more than 40 years ago. No experience and you pick up myths, et cetera such ta the fly shop spooling 20# on my reel, documents saying you need 200+m of line in case you get that monster, et cetera. But 40+ years later, large arbour reels and still evolving, I relook at my past assumptions and making my own decision. Personally, I am looking if anybody thinks 30# is not enough.Curious why we care so much for 20 / 30 / 50 lbs on backing: storage capacity sure, but over long lengths out the rod tip, doesn't the entirety of the line in play provide quite a bit of overall stretch and shock absorption?
And my experience of hanging up in coral or in a logjam, if you have a fly line in it, pulling it out is not good for the flyline, which gets back to ... is 20-30# good enough. The cool thing about "forums" with good people, you can have a good dialogue.For reels used for larger species (steelhead and salmon) I like to start at the tippet and use progressively higher strength line through the head, shooting line and the backing. My typical set up is something like this: 12-20 lb leader/ tippet, 25-40 lb core head, 35-65 lb shooting line all attached to the Hatch backing. My theory has more to do with breaking off a snag than fighting a fish. I want to get as much back as possible when it becomes necessary to break off.