What kind of reel? what are you fishing for? I use 30# hi-vis for my jig fishing. I also use the palomar knot to tie my main to my swivel. I dont use backing just put the powerpro directly on the reel.

Chromeo
_________________________
All Americans believe that they are born Fishermen. For a man to admit a distaste for fishing would be like denouncing mother-love and hating moonlight. -John Steinbeck