How many pounds can you pick up switching from a fast flight from a dacron string if any?

I would think none. A bow drawn 50#@28" is still 50#@28" regardless of string material. But FF will be faster then Dacron.

I am sure more knowledgeable people will chim in.

Hers is more than you bargained for....  

http://tradgang.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=118483

Whittler is correct.  How much performance gain you get (if any) will depend on several variables--don't expect it to change the world.  

The great thing about FF type materials is thier increased durability, lack of stretch, lack of creep, and reduced shock.

Chad