My family all use this rig and alpine clip it to a para cord type main line, not sure what type of line it is but it works great. We all steer away from the cable stuff cause the cable tends to tear a bigger hole and darts pull more often then not on swords and tuna.
I only deal with swords down here in Florida, but we use 450 pound ashaway tuna braid tied directly to the dart with a bowline. Minimal tearing of the flesh compared to a cable dart. Also like Mvywheels said there is less chance of pulling a dart.
I like vectran more since it doesn't get shredded if I go sharking. It's the same construction as the spectra. The vectran lets me stay away from cable and I only have my couple darts all the same. For just tuna 1/4" nylon is
Just fine I would think since lots of guys are doing that.
Not a dumb question at all, some ppl I would assume use it since it's super strong and to save space maybe? Not sure I just do it the old school way with nylon type it's worked for years and years. If it ain't broke don't fix it.