Re: World record distance WF 5wt?
I think that Steve Rajeff won the last Best of the West casting competition (back when it was a distance-only event for 5 wt. rods), with a cast of arouind 122'. So, if the original question was posed for a 5 wt. rod, then I think that's about as good as it gets.
With a specially built rod; I think usually a modified 7 wt., his record is around 238'.
The American two-handed casting record is over 300'
Jackster will have better information on this.