Re: Shock tippet?
Shock tippet for Tarpon is more for abrasion resistance as their mouths are very hard & gill plates very sharp.
I've used 30 lb nylon coated wire for Big Bluefish & Spanish Macs, with no problems but have never caught a shark on a fly. I would guess it will all depend on exactly how big the shark really is that takes the fly.
Remember, no one likes to be behind the big truck, but that's better than being under it!