If they are the small black eagle claw leaders that come in the small pack wrapped in a circle with small swivels and snaps...I would absolutely not trust them. 30 lb, is not enough, mostly because of the snaps and swivels....maybe with small pike lures, but I'd hate to lose expensive lures on bottom, or worse yet issue a death sentence by pinning jaws shut.
And yes, muskies can easily be handled and landed on light tackle...but if targeting them it is in your best interest, and the fish's to beef it up.
I realize the good leaders can be expensive, but they can usually handle more caught fish before looking like an accordion too. Good luck!
There is always a season!