The difference is in the length and the action. The FS83C that make great plug rods are 8' 3" and are nice and soft in the tip. The FS85C if I remember right 8' 6" and is a little stiffer in the action. The only rods that I use for pulling plugs is the FS83C. Been using this rod for about 35 years now.
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Remember always "Fish 4 Fun"
Puget Sound Anglers -Renton Chapter-
Co-Event Coordinator Salmon For Soldiers