im using 60# breaded strong enough to get some decent size shark (3-5ft). also using lure line at the bottom, got 3 of them 40# and breaded them together myself to make it stronger. will this work or will the shark just snap this.

Ben I catch lots of Black Tip and Spinner Sharks up to 6 feet on 30lb braid on a 6000 size spinning reel. I use a 100lb swivel to connect the 30lb to a 125lb monofilament leader. I prefer mono over steel...I think I get more hook ups.
Hope this helps!

Why is mono better than steel?

sometimes sharks get a little lock-jawed around steel, as it is more visible in the water vs mono, especially 7 strand. At night this isn't really a problem, or in deep waters. But fishing from shore or a boat in shallow water during the day you might end up with more hits on heavy mono rather than wire.