And to further the discussion. I have approached our local flyshop, and told them that some shops are providing the service of looping the end of one's flyline that does not have the loop. I just talked to a flyshop back East who I ordered a rod/reel/line outfit from, and they told me you can do it yourself....make a "welded" looped end yourself. You need but a curling iron. BUT, they said they don't trust welded looped ends as being as strong as the nail knot connection. And the loop shown in the picture is way, way to big!! The loops then do not "lock in" but slip around, and the transfer of energy is not as good as a nail knot connection.

For trout, it's nail knots all day. But where there's trout, there's predators, the streamer rod gets loops so I can quick change it up to chase larger fish.

I'm with Gtbigsky. I always tie a butt section to the fly line with a nail knot and then tie a perfection loop, which connects to another longer leader. That way I can change it up to chase larger fish as Koldkut says. Also, when the leader gets all banged up, I don't have to tie another nail knot to the fly line, just reconnect another looped leader to the butt section already attached to the fly line. Great topic!

Micro..And chances of a loop being a problem are seldom. Why not just nail knot on a leader, and then leave a foot long section of that butt when you want to tie on a new leader, and then blood knot to that. You should get the diameters right between the short butt section you nail knotted on, and the butt diameter of the new leader. But I now like loop to loop IF the flyline has a very small loop connection.

Not real silly ejunk IF you are really into it. Knot connections like a perfection loop have a tag end sticking out to the side. Get a windy day, and a light tippet can blow off course, and catch on a knot tag. Now strip it in, and get ready to cast, and more than likely you can kiss that leader goodby. Eliminating hangup spots on a leader where a light tippet can catch is a legitimate consideration. My latest change is to use "tippet rings" They will float a dry fly. I connect the last section before the tippet to a ring with a clinch knot, then connect my tippets to the other side of the ring. Use up the tippet, and tie a new tippet on, and not use up your up-leader taper making your leader last a whole lot longer.

Thought I responded to this yesterday but there is no entry. I must be losing my mind. I've liked loops ever since fly lines have come with the small pre-tied loops.

I've been doing loops for years...(Fly Line to leader only, blood knot for tippet) and I've never had one break from Tarpon to Tiddlers.