Fly Reel Backing

[The Spank]

I recently purchased a new second reel for an 8wt set-up that I am setting up with a Scientific Anglers WetCel Sink Tip Type-6 Fly Line. The line is 80' long with a 210 grain 27'-6" head length. The reel has a 150 yard 20lb backing capacity. I have a brand new spool of 20lb Scientific Anglers Dacron backing. Would that be enough or should I pick up another spool and fill the reel to its maximum 150 yard capacity? My question is not based on the worry of fish spooling me but on whether or not the fly line requires the full amount of backing for it to spool properly on the reel?

P.S I am getting this set-up primarily as a bucktailing setup for rainbows etc for a 2018 late spring/early summer BC interior trip fishing some of the big waters like Shuswap, Revelstoke etc.

[Fenix_84]

use your existing backing, it will be fine.

[The Spank]

Originally Posted by Fenix_84

use your existing backing, it will be fine.

I should have corrected my post to read I have a 100 yard spool of backing. Do I need the extra 50 yards or will the 100 yards suffice?

[Myles]

I would spool the reel to capacity.

[Fenix_84]

Originally Posted by The Spank

I should have corrected my post to read I have a 100 yard spool of backing. Do I need the extra 50 yards or will the 100 yards suffice?

100 will be fine.

[commieboy]

You do not NEED the extra line. It will still work just fine. More will simply give you more line to play fish (as you already know) and will increase your arbour size. The increased arbour size will allow more line to be gathered for every turn of the reel. On my 1 weight, I use hardly any backing.

[DrQuack]

100 yds will be fine. You would only need more for hard/long running bigger fish like bonefish/permit or silvers/chums/kings. Consider yourself fortunate if you find trout that will get you into half of your backing.