Quote Originally Posted by J Castwell
The ONLYway to get it exact is to put your fly line on and then fill what space is left over with backing. Yes, it's a pain in the butt, but, this stuff is supposed to be fun. Once you determine the exact amount of backing, reverse the whole works.
This I'm going to agree with 110%. Unless you go to a shop that can spool it for you.
It'll probably be 25 yards less with DT than WF. It also depends on if you get 12# or 20# dacron. If you use gel spun, you'll get a lot on it.