I agree with D'MAN
I am not into wire leaders... even when ice fishing tip-ups I only use a 14lb. mono leader off of my dacron!
With those 14lb. leaders I have caught many BIG pike, muskie and pickeral!... only lost a slight few!
As for casting or trolling... here is one from a week ago on 6lb stren with no leader and an X-RAP lure was used.
I was casting...
As for walleye... I used to use 8lb. but last year reduced to 6lb. for a bit more of a challenge.
But still have never used a wire leader.
Walleye are some finicky fish and I think a wire leader may just be a spook factor for them!
I went one whole walleye season on a particular lake, catching some pretty large sized walleye... and on 6lb. test I never lost a lure and better yet, never took off the first lure that I started that season with!
That was a great year, and I retired that lure back to an original box and put it on a display shelf because it was literally pokes full of all different sized holes and severely scraped up! Looks cool for a display piece to get comments on!
Anyways... Its all a personal preference.
But I go light... 6lb. test on my medium/light 6'6" rods with spinning reels and no leader for both casting for pike, jigging for eyes or trolling for eye... and whatever else wants to bite in between!