A 4lb 'gill would be something to see; not to de-rail the thread but a jack crevalle would pull any fresh water (nd most saltwater) fish of equal weight backwards up-and-down the beach. We got into some pods of 5 pounders busting baitfish at Sebastian Inlet last year using 9 weights and they wore us out after 2 hours. That may speak to our conditioning but those fish are amazing.
Regards,
Scott