I never could tie one of those leaders right, so I went a different path. I found some #1 size nickel sleeves that the # 25 wire will go thru 2x. I slide 2 sleeves on the wire and then add swivel/snap-lock and DOUBLE back thru the 2 sleeves.
I take a needle nose pliers and make a 90 degree bend after the first sleeve. I pull wire to desired loop size and then crimp the 2 sleeves. The last thing I do is cut the wire that is bent at the angle as close to the crimped sleeve as my little side cutters will allow.

If the edge is a little sharp, I hit it with a small diamond coated file I got from Harbor Freight as a hobbyist set.

When I'm all done I do a pull test like KF does.
So far they've held up that way. Just an alternative IF you can't do it the way KF described for whatever reason.