Pump handle ?'s
I've compared bouncing the bottom with 30# 7 strand wire and 1# ball at the same time as bouncing with 40# braid and 1 # ball working 100'. It took about 10% more braid as compared to wire to keep contact.
When using a thumper my best guesstimate at 2mph sog with 30# wire you get about 40% ie 100loc down 40.
Tie the 50# braid to a snap swivel using a uni knot connect the snap swivel to one the 3-way swivels connections. Tie anywhere from one to three foot of 20# to 25# mono to another of the 3-way swivel connections and add a snap to the mono so you can change out lead balls anywhere from 1 to 2 pounds. On the remaining 3-way swivel add a snubber. Connect six to 8 foot of 20# to 30# fluorocarbon to the snubber. Add a snap swivel to the fluorocarbon.
The amount of line will vary based on trolling speed and the weight you choose.