swivels and steel leaders?

We're old fashioned and still use J-hooks. Those Tru Turn catfish stainless hooks work good but we cant get big sizes around here 2/0 and 3/0 are the biggest Ive seen here. We dont use a leader per se. We slide the egg sinker on tie on a barrel swivel and pull 1'-2' of line between the two, cut it and tie the other end of the swivel and the hook on. Snap swivels will/can cost you fish. Slip sinker rig on the bottom we'll use a no.1 or 1/0 to a 5 or 6/0 depending on whats our target. Eating bullheads no.1 to a 2/0. Bigger flats 4/0, biggest flats maybe even 8/0 to 10/0.