Re: loop to loop connection for large Tarpon
You are correct. That nail knot will not hold up. You can use a braided loop made of 50 pound braided monofilament.
I would skip the loop. Create a three foot butt section of 30 to 40 pound monofilament. On the end of that, you should have a loop made from a Bimini Twist. Connect that butt section to the fly line using an Albright Knot. From there, you can make speedy loop to loop connections to your class tippet.